Preliminary W78E378/W78C378/W78C374

MONITOR CONTROLLER

Publication Release Date: December 1999

- 1 - Revision A1

GENERAL DESCRIPTION

The W78E378, W78C378 and W78C374B are ASIC which is a stand-alone high-performance
microcontroller specially designed for monitor control applications. The device integrates the
embedded 80C31 microcontroller core, on-chip MTP or Mask ROM, 576 bytes of RAM, and a number
of dedicated hardware monitor functions. Additional special function registers are incorporated to
control the on-chip peripheral hardware. The chip is used to control the interface signal of other
devices in the monitor and to process the video sync signals. Because of the highly integration and
Flash cell for program memory, the device can offer users the competitive advantages of low cost
and reduced development time.

FEATURES

80C31 MCU Core Embedded

32K Bytes MTP-ROM (W78E378)

32K Bytes Mask-ROM (W78C378)

16K Bytes Mask-ROM (W78C374B)

Total 576 Bytes of On-chip Data RAM

256 bytes accessed as in the 80C32

320 bytes accessed as external data memory via "MOVX @Ri"

PWM DACs

Eight 8-bit Static PWM DACs: DAC0

DAC8

Three 8-bit Dynamic PWM DACs: DAC9

DAC10

Sync Processor

Horizontal & Vertical Polarity Detector

Sync Separator for Composite Sync

12-bit Horizontal & Vertical Frequency Counter

Programmable Dummy Frequency Generator

Programmable H-clamp Pulse Output

SOA Interrupt

Hsync/2 Output

Serial Ports:

DDC1 Port- support DDC1

SIO1 & SIO2 Ports - each can support DDC2B/2B+/2Bi/2AB (each has 2 slave addresses)

Two 16-bit Timer/Counters (8031's Timer0 & Timer1)

One External Interrupt Input (8031's INT0 )

One Parabola Interrupt Generator

One ADC with 7 Multiplexed Analog Inputs

Two 12 mA(min) Output Pins for Driving LEDs

Watchdog Timer (2

/Fosc = 0.42s @Fosc = 10 MHz)

Power Low Reset

Frequency: 10 MHz max. (with the same performance as a normal 8051 that uses 20 MHz)

Packaged in 40/32-pin 600 mil DIP & 44-pin PLCC

Preliminary W78E378/W78C378/W78C374

- 2 -

PIN CONFIGURATIONS

40-pin DIP:

W78E378E

40-pin DIP

W78C378E

P4.1

P4.2

W78C374E

P4.0 (HFI)

32-pin DIP

P4.3

P3.5 (ADC4, T0)*

P3.6 (ADC5, T1)*

P1.1 (DAC1)*

P1.2 (DAC2)*

32-pin DIP:

W78E378

P1.0 (DAC0)*

P1.3 (DAC3)*

W78C378

P3.4 (VOUT)

P1.4 (DAC4)*

W78C374

P3.3 (HOUT)

P1.5 (DAC5)*

P1.6 (DAC6)*

P1.7 (DAC7)*

RESET

P2.0 (DAC8)

P2.1 (DAC9)

SSA

P2.2 (DAC10)

OSCOUT

P2.3 (Hclamp)

OSCIN

P2.4 (ADC0)

P3.2 ( INT0 )

P2.5 (ADC1)

P3.1 (SCL)*

P2.6 (ADC2)

P3.0 (SDA)*

P2.7 (ADC3)

P3.7 (ADC6)*

P4.7 (HFO)

P4.4 (SCL2)*

P4.6

P4.5 (SDA2)*

44-pin PLCC

H
V

RESET

VDDA

VSSA

OSCOUT

OSCIN

NC
P1.5
P1.6
P1.7
P2.0
P2.1
P2.2
P2.3

P
3
.
1

V
S
S

P
3
.
0

P
3
.
7

P
4
.
6

P
4
.
5

P
4
.
4

P
4
.
7

7
8
9

10
11
12
13
14
15
16
17

1
8

1
9

2
0

2
2

2
6

2
5

2
4

2
3

2
8

2
1

2
7

35
34

4
0

4
1

4
2

4
3

4
4

P
3
.
4

P
1
.
0

P
1
.
1

P
3
.
5

P
3
.
6

P
1
.
2

P
4
.
3

P
1
.
3

P3.2

P3.3

P
4
.
2

P
4
.
1

P
4
.
0

P1.4

P2.5

P2.4

P
2
.
7

P
2
.
6

V
S
S

W78E378P

W78C378P

W78C374P

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 3 - Revision A1

PIN DESCRIPTION

PIN NAME

I/O

DESCRIPTION

RESET

I/O Chip reset input (active low) input &

Internal reset output (generated by WDT or power low)

TTL Schmitt trigger input, internal pull-up ~30 K

= +12 mA @V

= 0.45V

Positive power supply

Ground

OSC

OUT

O Output from the inverting oscillator amplifier

OSC

Input to the inverting oscillator amplifier, 10 MHz max.

Hsync input

TTL Schmitt trigger input , w/o PMOS

= 2.0V/0.8V, V+/ V- = ~1.6V/ 1.1V

Vsync input

TTL Schmitt trigger input, w/o PMOS

= 2.0V/0.8V, V+/ V- = ~1.6V/ 1.1V

P1.0 (DAC0)

I/O General purpose I/O, DAC0 special function output

Open-drain output, sink current: 15 mA

P1.1 (DAC1)

I/O General purpose I/O, DAC1 special function output

Open-drain output, sink current: 15 mA

P1.2 (DAC2)

I/O General purpose I/O, DAC2 special function output

Open-drain output, sink current: 4 mA

P1.3 (DAC3)

I/O General purpose I/O, DAC3 special function output

Open-drain output, sink current: 4 mA

P1.4 (DAC4)

I/O General purpose I/O, DAC4 special function output

Open-drain output, sink current: 4 mA

P1.5 (DAC5)

I/O General purpose I/O, DAC5 special function output

Open-drain output, sink current: 4 mA

P1.6 (DAC6)

I/O General purpose I/O, DAC6 special function output

Open-drain output, sink current: 4 mA

P1.7 (DAC7)

I/O General purpose I/O, DAC7 special function output

Open-drain output, sink current: 4 mA

Preliminary W78E378/W78C378/W78C374

- 4 -

Pin Description, Continued

PIN NAME

I/O

DESCRIPTION

P2.0 (DAC8)

I/O General purpose I/O, DAC8 Special Function output

Sink/Source current: 4 mA/-100

A (-4 mA for SF output)

P2.1 (DAC9)

I/O General purpose I/O, DAC9 Special Function output

Sink/Source current: 4 mA/-100

A (-4 mA for SF output)

P2.2 (DAC10)

I/O General purpose I/O, DAC10 Special Function output

Sink/Source current: 4 mA/-100

A (-4 mA for SF output)

P2.3 (Hclamp)

I/O General purpose I/O, Hclamp Special Function output

Sink/Source current: 4 mA/-100

A (-4 mA for SF output)

P2.4 (ADC0)

I/O General purpose I/O, ADC input channel 0

Sink/Source current: 4 mA/-100

P2.5 (ADC1)

I/O General purpose I/O, ADC input channel 1

Sink/Source current: 4 mA/-100

P2.6 (ADC2)

I/O General purpose I/O, ADC input channel 2

Sink/Source current: 4 mA/-100

P2.7 (ADC3)

I/O General purpose I/O, ADC input channel 3

Sink/Source current: 4 mA/-100

P3.0 (SDA)

I/O General purpose I/O, DDC port serial data I/O

Schmitt trigger input
V

= 0.7 V

/0.3 V

, V+/V- = ~0.6 V

/ 0.4 V

Open-drain output, sink current: 8 mA

P3.1 (SCL)

I/O General purpose I/O, DDC port serial clock I/O

Schmitt trigger input
V

= 0.7 V

/0.3 V

, V+/V- = ~0.6 V

/ 0.4 V

Open-drain output, sink current: 8 mA

P3.2 ( INT0 )

I/O General purpose I/O, INT0 input

Sink/Source current: 1 mA/ -100

P3.3 (H

OUT

)

I/O General purpose I/O, H

OUT

special function output

Sink/Source current: 4 mA/-100

A (-4 mA for SF output)

P3.4 (V

OUT

)

I/O General purpose I/O, V

OUT

special function output

Sink/Source current: 4 mA/-100

A (-4 mA for SF output)

P3.5 (ADC4, T0) I/O General purpose I/O, ADC input channel 4

Open-drain output, sink current: 4 mA

P3.6 (ADC5, T1) I/O General purpose I/O, ADC input channel 5

Open-drain output, sink current: 4 mA

P3.7 (ADC6)

I/O General purpose I/O, ADC input channel 6

Open-drain output, sink current: 4 mA

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 5 - Revision A1

Pin Description, Continued

PIN NAME

I/O

DESCRIPTION

P4.0 (HFI)

I/O P4.0 Output, HFI Input

Sink/Source current: 4 mA/-4 mA

P4.1

P4.1 Output

Sink/Source current: 4 mA/-4 mA

P4.2

P4.2 Output

Sink/Source current: 4 mA/-4 mA

P4.3

P4.3 Output

Sink/Source current: 4 mA/-4 mA

P4.4 (SCL2)

I/O P4.4 Output, SIO2 port serial clock I/O

Schmitt trigger input

= 0.7 V

/0.3 V

, V+/V- = ~0.6 V

/0.4 V

Open-drain output, sink current: 8 mA

P4.5 (SDA2)

I/O P4.5 Output, SIO2 port serial data I/O

Schmitt trigger input

= 0.7 V

/0.3 V

, V+/V- = ~0.6 V

/0.4 V

Open-drain output, sink current: 8 mA

P4.6

P4.6 Output

Sink/Source current: 4 mA/-4 mA

P4.7 (HFO)

P4.7 Output, HFO Output

Sink/Source current: 4 mA/-4 mA

Preliminary W78E378/W78C378/W78C374

- 6 -

BLOCK DIAGRAM

CPU

Osc.
Circuit

Reset
Circuit

Power Low
Detection

INT0 (P3.2)

Interrupt
Processor

Timer 0
Timer 1

OSCIN

OSCOUT

80C31 Core excluding internal RAM

ADC

ADC0 (P2.4)
ADC1 (P2.5)
ADC2 (P2.6)
ADC3 (P2.7)
ADC4 (P3.5)
ADC5 (P3.6)
ADC6 (P3.7)

VPP (P3.2)

8-bit Internal Bus

Watch Dog
Timer

Sync.
Processor

I/O Port

Static DACs

Dynamic DACs

DAC0~7 (P1.0~P1.7)

DAC8~10 (P2.0~P2.2)

SIO1

SCL (P3.1)

SDA (P3.0)

RESET

Program Memory

RAM: 576 Bytes

Data Memory

T0 (P3.5)

T1 (P3.6)

Note:
P1, P4.4~P4.5
P3.0~P3.1 & P3.5~P3.7
are open-drain.

Note:
freq1 = freq2

freq1

freq2

P1, P2, P3

SIO2

SCL2 (P4.4)

SDA2 (P4.5)

HIN, VIN

HFI (P4.0)

VOUT (P3.4)
HOUT (P3.3)

Hclamp (P2.3)

HFO (P4.7)

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 7 - Revision A1

FUNCTIONAL DESCRIPTION

Address Space

Direct Addressing
"MOV"

Indirect Addressing
"MOV @Ri"

Internal RAM

256 Bytes

8051SFRs &

Serial Ports SFRs

Internal

Program Memory

External Access
"MOVX @Ri"

On-Chip Data Memory

128 Bytes

00h

80h

FFh

00h

Direct or Indirect
Addressing
"MOV" or "MOV @Ri"

new SFRs

80h

External Access
"MOVX @Ri"

0000h

External Access
"MOVX @Ri"

On-Chip Data Memory

64 Bytes

C0h

On-Chip Data Memory

128 Bytes

00h

External Access
"MOVX @Ri"

BANK0

BANK1

FFh

7Fh

BFh

7FFFh

External Access
"MOVX @Ri"

(3FFFh)

Program/Data/SFRs Address Space

SFRs accessed using 'Direct Addressing'

REGISTER

ADDRESS

BITS

POWER

ON RESET

RESET

R/W

E0h

00h

R/W

F0h

00h

R/W

PSW*

D0h

00h

R/W

81h

00h

R/W

DPL

82h

00h

R/W

DPH

83h

00h

R/W

IE*

A8h

00h

R/W

IP*

B8h

00h

R/W

TCON*

88h

00h

R/W

TMOD

89h

00h

R/W

TL0

8Ah

00h

R/W

TH0

8Ch

00h

R/W

TL1

8Bh

00h

R/W

TH1

8Dh

00h

R/W

PCON

87h

00h

x0h

R/W

Preliminary W78E378/W78C378/W78C374

- 8 -

SFRs accessed using 'Direct Addressing', continued

REGISTER

ADDRESS

BITS

POWER

ON RESET

RESET

R/W

P1*

90h

00h

R/W

P2*

A0h

FFh

R/W

P3*

B0h

1Fh

R/W

TMREG*

C0h

00h

xxh

R/W

S1CON*

D8h

00h

R/W

S1STA

D9h

F8h

S1DAT

DAh

FFh

R/W

S1ADR1

DBh

00h

R/W

S1ADR2

DCh

00h

R/W

S2CON*

E8h

00h

R/W

S2STA

E9h

F8h

S2DAT

EAh

FFh

R/W

S2ADR1

EBh

00h

R/W

S2ADR2

ECh

00h

R/W

Notes:
1. The SFRs marked with an asterisk (*) are both bit- and byte-addressable.
2. Port 1 and P3.5

P3.7 outputs low during & after reset.

3. "x" means no reset action.

4. The SFRs in the shaded region are new-defined.

* Modified

PCON

BIT

NAME

FUNCTION

ADCS2

ADC channel Select bit 2

Power Down bit

GF0

General purpose flag bit

GF1

General purpose flag bit

TEST0

Test purpose flag bit

TEST1

Test purpose flag bit

ADCcal

Set 0/1 to select 1.0V/3.0V for ADC calibration

CPUhalt

Set to let CPU halt when the chip runs internally

TMREG: Test Mode Register

BIT

NAME

FUNCTION

TM1

Test Mode1

TM2

Test Mode2

TM3

Test Mode3

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 9 - Revision A1

SFRs accessed using 'MOVX @Ri'

REGISTER

ADDRESS

BITS

POWER

ON RESET

RESET

R/W

TYPE

CTRL1

80h

00h

CTRL2

81h

00h

P1SF

82h

00h

xxh

P2SF

83h

00h

xxh

P3SF

84h

00h

PARAL

85h

00h

R/W

PARAH

86h

00h

R/W

HFCOUNTL

87h

HFCOUNTH

88h

VFCOUNTL

89h

VFCOUNTH

8Ah

WDTCLR

8Bh

SOARL

8Ch

8/6

R/W

SOARH

8Dh

8/6

R/W

SOACLR

8Eh

INTMSK

8Fh

00h

R/W

INTVECT

90h

00h

INTCLR

91h

DDC1

92h

ADC

93h

DAC0

94h

00h

R/W

DAC1

95h

00h

R/W

DAC2

96h

00h

R/W

DAC3

97h

00h

R/W

DAC4

98h

00h

R/W

DAC5

99h

00h

R/W

DAC6

9Ah

00h

R/W

DAC7

9Bh

00h

R/W

DAC8

9Ch

00h

R/W

DAC9

9Dh

00h

R/W

DAC10

9Eh

00h

R/W

9Fh

FFh

CTRL3

A0h

00h

Note: "x" means no reset action.

Preliminary W78E378/W78C378/W78C374

- 10 -

CTRL1: Control Register 1 (Write Only)

BIT

NAME

FUNCTION

ADCSTRT

A-to-D Conversion START control

Set by S/W to start conversion.
Cleared by H/W while conversion completed (read SOARH.6 to check).

ADCS0

ADC channel Select bit 0

ADCS1

ADC channel Select bit 1

ENDDC1

Enable DDC1

HCES

H-Clamp Edge Select
0: Select leading edge of restored Hsync

1: Select trailing edge of restored Hsync

HCWS

H-Clamp Width Select bit

DUMMYEN

Dummy signal Enable

VSDIS

Vsync Separator Disable, 0: Enable, 1: Disable

CTRL2: Control Register 2 (Write Only)

BIT

NAME

FUNCTION

HSPS

HSync Polarity Select

0: Positive, 1: Negative

VSPS

VSync Polarity Select

0: Positive, 1: Negative

HDUMS0

H Dummy frequency Select 0

VDUMS

V Dummy frequency Select

DDC1B9

Bit 9 in DDC1 mode

WDTEN

Enable Watch Dog Timer

SOAHDIS

Disable SOA low to high detection

OSCHI

OSC freq. Higher than 10 MHz

CTRL3: Control Register 3 (Write Only)

BIT

NAME

FUNCTION

ENHFO

Enable HF input/output for P4.0/P4.7, respectively

0: Disable, 1: Enable

HDUMS1

H Dummy frequency Select 1

HFO_POL

Select HFO polarity
0: Positive, 1: Negative

HFO_HALF

Select HFO output freq.

0: the same as HFI, 1: half of the HFI

ENBNK1

Select on-chip ext. RAM bank

0: Bank 0, 1: Bank 1

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 11 - Revision A1

*P1SF: Port1 special function output enable register (Write Only)

BIT

NAME

FUNCTION

P10SF

Port 1.0 Special Function enable (DAC0 output)

P11SF

Port 1.1 Special Function enable (DAC1 output)

P12SF

Port 1.2 Special Function enable (DAC2 output)

P13SF

Port 1.3 Special Function enable (DAC3 output)

P14SF

Port 1.4 Special Function enable (DAC4 output)

P15SF

Port 1.5 Special Function enable (DAC5 output)

P16SF

Port 1.6 Special Function enable (DAC6 output)

P17SF

Port 1.7 Special Function enable (DAC7 output)

*P2SF: Port2 special function output enable register (Write Only)

BIT

NAME

FUNCTION

P20SF

Port 2.0 Special Function enable (DAC8 output)

P21SF

Port 2.1 Special Function enable (DAC9 output)

P22SF

Port 2.2 Special Function enable (DAC10 output)

P23SF

Port 2.3 Special Function enable (Hclamp output)

P24SF

Port 2.4 Special Function enable (ADC0 input)

P25SF

Port 2.5 Special Function enable (ADC1 input)

P26SF

Port 2.6 Special Function enable (ADC2 input)

P27SF

Port 2.7 Special Function enable (ADC3 input)

*P3SF: Port3 special function output enable register (Write Only)

BIT

NAME

FUNCTION

P33SF

Port 3.3 Special Function enable (H

OUT

)

P34SF

Port 3.4 Special Function enable (V

OUT

)

*HFCOUNTL: Horizontal frequency counter register, low byte (Read Only)

BIT

NAME

FUNCTION

HF0

H frequency count bit 0

HF1

H frequency count bit 1

HF2

H frequency count bit 2

HF3

H frequency count bit 3

HF4

H frequency count bit 4

HF5

H frequency count bit 5

HF6

H frequency count bit 6

HF7

H frequency count bit 7

Preliminary W78E378/W78C378/W78C374

- 12 -

*HFCOUNTH: Horizontal frequency counter register, high byte (Read Only)

BIT

NAME

FUNCTION

HF8

H frequency count bit 8

HF9

H frequency count bit 9

HF10

H frequency count bit 10

HF11

H frequency count bit 11

NOH

Set by hardware if no Hin signal

HPOL

Hin polarity. 0: Positive, 1: Negative

*VFCOUNTL: Vertical frequency counter register, low byte (Read Only)

BIT

NAME

FUNCTION

VF0

V frequency count bit 0

VF1

V frequency count bit 1

VF2

V frequency count bit 2

VF3

V frequency count bit 3

VF4

V frequency count bit 4

VF5

V frequency count bit 5

VF6

V frequency count bit 6

VF7

V frequency count bit 7

*VFCOUNTH: Vertical frequency counter register, high byte (Read Only)

BIT

NAME

FUNCTION

VF8

V frequency count bit 8

VF9

V frequency count bit 9

VF10

V frequency count bit 10

VF11

V frequency count bit 11

NOV

Set by hardware if no V

signal

VPOL

polarity. 0: Positive, 1: Negative

INTVECT: Interrupt Vector Register (Read Only)

BIT

NAME

FUNCTION

SCLINT

SCL pin pulled low detected

ADCINT

ADC conversion completed

DDC1INT

DDC1 port buffer empty

SOAINT

SOA condition happen

VEVENT

Vsync pulse detected or NOV = 1 (V counter overflow)
(The VEVENT is designed to be generated only 'one' time
if no Vsync input.)

PARAINT

Parabola Interrupt generated

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 13 - Revision A1

INTMSK: Interrupt Mask Register (Read/Write)

BIT

NAME

FUNCTION

MSCLINT

Set/clear to enable/disable SCLINT

MADCINT

Set/clear to enable/disable ADCINT

MDDC1INT Set/clear to enable/disable DDC1INT

MSOAINT

Set/clear to enable/disable SOAINT

MVEVENT Set/clear to enable/disable VEVENT

MPARAINT Set/clear to enable/disable PARAINT

INTCLR (Write Only)

BIT

NAME

FUNCTION

CSCLINT

Write 1 to this bit to clear SCLINT in INTVECT

CADCINT

Write 1 to this bit to clear ADCINT in INTVECT

CDDC1INT Write 1 to this bit to clear DDC1INT in INTVECT

CSOAINT

Write 1 to this bit to clear SOAINT in INTVECT

CVEVENT

Write 1 to this bit to clear VEVENT in INTVECT

CPARAINT Write 1 to this bit to clear PARAINT in INTVECT

*PARAL: Parabola interrupt generator register, low byte (Read/Write)

BIT

NAME

FUNCTION

PARA0

PARAINT period register bit 0

PARA1

PARAINT period register bit 1

PARA2

PARAINT period register bit 2

PARA3

PARAINT period register bit 3

PARA4

PARAINT period register bit 4

PARA5

PARAINT period register bit 5

PARA6

PARAINT period register bit 6

PARA7

PARAINT period register bit 7

*PARAH: Parabola interrupt generator register, high byte (Read/Write)

BIT

NAME

FUNCTION

PARA8

PARAINT period register bit 8

PARA9

PARAINT period register bit 9

PARA10

PARAINT period register bit 10

PARA11

PARAINT period register bit 11

PARA12

PARAINT period register bit 12

Preliminary W78E378/W78C378/W78C374

- 14 -

*SOARL: SOA register, low byte (Read/Write)

BIT

NAME

FUNCTION

SL0

SOA Low register bit 0

SL1

SOA Low register bit 1

SL2

SOA Low register bit 2

SL3

SOA Low register bit 3

SL4

SOA Low register bit 4

SL5

SOA Low register bit 5

(OVL)

OVL = 1: current H count larger than SOARL, for test

(OVH)

OVH = 1: current H count smaller than SOARH, for test

*SOARH: SOA register, high byte (Read/Write)

BIT

NAME

FUNCTION

SH0

SOA High register bit 0

SH1

SOA High register bit 1

SH2

SOA High register bit 2

SH3

SOA High register bit 3

SH4

SOA High register bit 4

SH5

SOA High register bit 5

(ADCSTRT) ADCSTRT bit status, for test

(WDTQ10) Watch Dog Timer, bit 10, for test

ADC

Result of the A-to-D conversion.

* DAC0~DAC8

8-bit PWM static DAC register.

DAC9~DAC10

8-bit PWM dynamic DAC register.

WDTCLR

Watchdog-timer-clear register, without real hardware but an address.

Writing any value to WDTCLR will clear the watchdog timer.

SOACLR

Safe-Operation-Area Clear register, without real hardware but an address.

Writing any value to SOACLR will clear the SOAINT.

* DDC1

DDC1 latch buffer.

S1CON

SIO1 control register.

S1STA

SIO1 status register.

S1DAT

SIO1 data register.

S1ADR1, S1ADR2 SIO1 address registers.

S2CON

SIO2 control register.

S2STA

SIO2 status register.

S2DAT

SIO2 data register.

S2ADR1, S2ADR2 SIO2 address registers.

Preliminary W78E378/W78C378/W78C374

- 16 -

DDC1/SIO1 and SIO2 Ports
1. DDC1/SIO1 port

DDC1

ENDDC1

DDC Port

SCL

SDA

SIO1

Support DDC2B/2B+

Support DDC1

OUT

SCL

SDA

SCL

Vsync

ENDDC1 = 1, used as DDC1 (Display Data Channel) port:

To support DDC1, use Vsync signal for shift clock and P3.0 (SDA) for data output.

ENDDC1 = 0, used as SIO1 port:

To support DDC2B/2B+/2Bi/2AB, use P3.1 (SCL) for serial clock and P3.0 (SDA) for serial data.

SCLINT interrupt is generated when SCL (P3.1) has a high-to-low transition and then keeps at low for

1/Fosc.

Fosc

8 MHz

10 MHz

SCL low

1.6

2. SIO2 port:

To support DDC2B/2B+/2Bi/2AB, use P4.4 (SCL) for serial clock and P4.5 (SDA) for serial data.

DDC1 Port

The DDC1 is a serial output port that supports DDC1 communication. To enable the DDC1 port,
ENDDC1 (bit 3 of CTRL1) should be set to '1'. Once previous eight data bits in the shift register and
one null bit (the 9th bit) are shifted out to the SDA sequentially on each

rising edge of the V

signal,

the DDC1 control circuit loads the next data byte from the latch buffer (the DDC1 register) to the shift
register and generates a DDC1INT signal to the CPU. In the interrupt service routine, the S/W should
fetch the next byte of EDID data and write it to the DDC1 register. If ENDDC1 is cleared, the shift
register is stopped, and the SDA output is kept high. The bit DDC1B9 (bit 4 of CTRL2) decides the 9th
bit in a DDC transmission. If DDC1B9 is set, the 9th bit will be '1', otherwise '0'.

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 17 - Revision A1

To use DDC1 port, a user should pay attention to the following items:

(1) When the chip is powered-on or after reset , the 8-bit shift register in DDC1 H/W contains all 0s. If

you write a data to the latch buffer (the DDC1 register), it will be loaded to the shift register at the
9th clock (on V

), so from the 10th clock, the real data bit begins to shift out.

(2) Because there is no reset signal to the latch buffer, it contains a random data after power-on. If

you enable DDC1 without writing data to the latch buffer, SDA will have the random data shifted
out after 9 clocks. The shift register is reset to 00H during CPU reset.

(3) The DDC1 H/W has a counter that counts how many bits shifted out. This counter is initialized to 0

when power-up or reset. When you firstly enable DDC1 after power-on, the first bit is already
shifted out without clock, so the first clock triggers the second data bit (D6) to shift out and "0000
0001 1" will be got. After the first 9 clocks that shift out an invalid byte, the counter counts from 1
to 9 cyclically according to the clock pulse on V

-pin. See the following illustration.

After power on, the

counter count:

0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 ...

shifted-out data bit:

0 0 0 0 0 0 0 1

D7 D6 D5 D4 D3 D2 D1 D0

ack

D7 D6 D5 D4 D3 D2 D1 D0

ack ...

clock pulse:

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 ...

|--> invalid data |--> normal data

(4) The interrupt happens on the failing edge of the following first clock. The next data, which is about

to be shifted out, in the latch buffer is loaded into the shift register at the rising edge of the
following first clock. At the same time, data bit D7 is shifted out and the counter value is "1".

SIO1 Port (with two slave addresses)

The SIO1 port is a serial I/O port, which supports all transfer modes from and to the I

C bus. The

SIO1 port handles byte transfers autonomously. To enable this port, the bit ENDDC1 in CTRL1
should be cleared to '0'. The CPU interfaces to the SIO1 port through the following five special
function registers:

S1CON (control register, D8h), S1STA (status register, D9h), S1DAT (data

S1ADR1/S1ADR2 (address registers, DBh/DCh). The SIO1 H/W interfaces to the

C bus via two pins: SDA (P3.0, serial clock line) and SCL (P3.1, serial data line). The output latches

of P3.0 and P3.1 must be set to "1" before using this port.

SIO2 Port (with two slave addresses)

The function of this port is the same as SIO1 port. The CPU interfaces to the SIO2 port through the
following five special function registers:

S2CON (control register, E8h), S2STA (status register, E9h),

S2DAT (data register, EAh) and S2ADR1/S2ADR2 (address registers, EBh/ECh). The SIO2 H/W
interfaces to the I

C bus via two pins: SDA2 (P4.5, serial clock line) and SCL2 (P4.4, serial data line).

The output latches of P4.5 and P4.4 must be set to "1" before using this port.

Operation of SIO1 Port: (SIO2 has the same function except their addresses of control registers)

Preliminary W78E378/W78C378/W78C374

- 18 -

a) Control Registers
a-1) The Address Registers, S1ADR1, S1ADR2

The SIO1 is equipped with two address registers: S1ADR1 & S1ADR2. The CPU can read from and
write to these two 8-bit, directly addressable SFRs. The content of these registers are irrelevant when
SIO1 is in master modes. In the slave modes, the seven most significant bits must be loaded with the
MCU's own address. The SIO1 hardware will react if either of the addresses is matched.

|------------------------ Own Slave Address -----------------------|

a-2) The Data Register, S1DAT

This register contains a byte of serial data to be transmitted or a byte which has just been received.
The CPU can read from or write to this 8-bit directly addressable SFR while it is not in the process of
shifting a byte. This occurs when SIO1 is in a defined state and the serial interrupt flag (SI) is set.
Data in S1DAT remains stable as long as SI is set. While data is being shifted out, data on the bus is
simultaneously being shifted in; S1DAT always contains the last data byte present on the bus. Thus,
in the event of lost arbitration, the transition from master transmitter to slave receiver is made with
the correct data in S1DAT.

SD7

SD6

SD5

SD4

SD3

SD2

SD1

SD0

|<---------------------------- Shift direction -----------------------------

S1DAT and the acknowledge bit form a 9-bit shift register, the acknowledge bit is controlled by the
SIO1 hardware and cannot be accessed by the CPU. Serial data is shifted through the acknowledge
bit into S1DAT on the rising edges of serial clock pulses on the SCL line. When a byte has been
shifted into S1DAT, the serial data is available in S1DAT, and the acknowledge bit (ACK or NACK) is
returned by the control logic during the ninth clock pulse. Serial data is shifted out from S1DAT on the
falling edges of SCL clock pulses, and is shifted into S1DAT on the rising edges of SCL clock pulses.

a-3) The Control Register, S1CON

The CPU can read from and write to this 8-bit, directly addressable SFR. Two bits are affected by the
SIO1 hardware: the SI bit is set when a serial interrupt is requested, and the STO bit is cleared when
a STOP condition is present on the bus. The STO bit is also cleared when ENS1 = "0".

CR2

ENS1

STA

STO

CR1

CR0

ENS1, the SIO1 Enable Bit

ENS1 = "0": When ENS1 is "0", the SDA and SCL outputs are in a high impedance state. SDA and
SCL input signals are ignored, SIO1 is in the not addressed slave state, and STO bit in S1CON is
forced to "0". No other bits are affected. P3.0 (SDA) and P3.1 (SCL) may be used as open drain I/O
ports.

ENS1 = "1": When ENS1 is "1", SIO1 is enabled. The P3.0 and P3.1 port latches must be set to logic
1.

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 19 - Revision A1

STA, the START Flag

STA = "1": When the STA bit is set to enter a master mode, the SIO1 hardware checks the status of
I2C bus and generates a START condition if the bus is free. If the bus is not free, then SIO1 waits for
a STOP condition and generates a START condition after a delay. If STA is set while SIO1 is already
in a master mode and one or more bytes are transmitted or received, SIO1 transmits a repeated
START condition. STA may be set at any time. STA may also be set when SIO1 is an addressed
slave.

STA = "0": When the STA bit is reset, no START condition or repeated START condition will be
generated.

STO, the STOP Flag

STO = "0": When the STO bit is set while SIO1 is in a master mode, a STOP condition is transmitted
to the I2C bus. When the STOP condition is detected on the bus, the SIO1 hardware clears the STO
flag. In a slave mode, the STO flag may be set to recover from an bus error condition. In this case, no
STOP condition is transmitted to the I2C bus. However, the SIO1 hardware behaves as if a STOP
condition has been received and switches to the defined not addressed slave receiver mode. The
STO flag is automatically cleared by hardware. If the STA and STO bits are both set, then a STOP
condition is transmitted to the I2C bus if SIO1 is in a master mode (in a slave mode, SIO1 generates
an internal STOP condition which is not transmitted). SIO1 then transmits a START condition.

SI, the Serial Interrupt Flag

SI = "1": When a new SIO1 state is present in the S1STA register, the SI flag is set by hardware, and,
if the EA and ES bits (in IE register) are both set, a serial interrupt is requested. The only state that
does not cause SI to be set is state F8H, which indicates that no relevant state information is
available. When SI is set, the low period of the serial clock on the SCL line is stretched, and the serial
transfer is suspended. A high level on the SCL line is unaffected by the serial interrupt flag. SI must
be cleared by software.

SI = "0": When the SI flag is reset, no serial interrupt is requested, and there is no stretching on the
serial clock on the SCL line.

AA, the Assert Acknowledge Flag

AA = "1": If the AA flag is set, an acknowledge (low level to SDA) will be returned during the
acknowledge clock pulse on the SCL line when: 1) The own slave address has been received. 2) A
data byte has been received while SIO1 is in the master receiver mode. 3) A data byte has been
received while SIO1 is in the addressed slave receiver mode.

AA = "0": If the AA flag is reset, a not acknowledge (high level to SDA) will be returned during the
acknowledge clock pulse on SCL when: 1) A data has been received while SIO1 is in the master
receiver mode. 2) A data byte has been received while SIO1 is in the addressed slave receiver mode.

CR0, CR1 and CR2, the Clock Rate Bits

These three bits determine the serial clock frequency when SIO1 is in a master mode. It is not
important when SIO1 is in a slave mode. In the slave modes, SIO1 will automatically synchronize
with any clock frequency up to 100 KHz.

Preliminary W78E378/W78C378/W78C374

- 20 -

Bit Freq. (KHz) @Fosc

CR2

CR1

CR0

8 MHz

10 MHz

Fosc Divided

31.25

39.1

256

35.7

44.6

224

41.7

52.1

192

50.0

62.5

160

8.3

10.4

960

66.7

83.3

120

133.3

166.7

a-4) The Status Register, S1STA

S1STA is an 8-bit read-only register. The three least significant bits are always 0. The five most
significant bits contain the status code. There are 23 possible status codes. When S1STA contains

F8H

, no serial interrupt is requested. All other S1STA values correspond to defined SIO1 states.

When each of these states is entered, a status interrupt is requested (SI = 1). A valid status code is
present in S1STA one machine cycle after SI is set by hardware and is still present one machine
cycle after SI has been reset by software.

In addition, state

00H

stands for a Bus Error. A Bus Error occurs when a START or STOP condition is

present at an illegal position in the format frame. Examples of illegal positions are during the serial
transfer of an address byte, a data byte or an acknowledge bit.

b) Operating Modes

The four operating modes are: Master/Transmitter, Master/Receiver, Slave/Transmitter and
Slave/Receiver. Bits STA, STO and AA in S1CON decide the next action the SIO1 hardware will take
after SI is cleared. When the next action is completed, a new status code in S1STA will be updated
and SI will be set by hardware in the same time. Now, the interrupt service routine is entered (if the
SI_interrupt is enabled), the new status code can be used to decide which appropriate service routine
the software is to branch. Data transfers in each mode are shown in the following figures.

*** Legend for the following four figures:

(STA,STO,SI,AA)=(0,0,0,X)

SLA+W will be transmitted;
ACK bit will be received.

SLA+W has been transmitted;
ACK has been received.

18H

08H

A START has been
transmitted.

Last action is done

Last state

Next setting in S1CON

Expected next action

New state

Next action is done

1) "Data byte will be transmitted":
Software should load the data byte (to be transmitted) into S1DAT
before new S1CON setting is done.

2) "SLA+W (R) will be transmitted":
Software should load the SLA+W/R (to be transmitted) into S1DAT
before new S1CON setting is done.

3) "Data byte will be received":
Software can read the received data byte from S1DAT
while a new state is entered.

Software's access to S1DAT with respect to "Expected next action":

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 21 - Revision A1

(STA,STO,SI,AA)=(0,0,0,X)

SLA+W will be transmitted;
ACK bit will be received.

Master/Transmitter Mode

From Master/Receiver (B)

Set STA to generate
a START.

SLA+W has been transmitted;
ACK has been received.

18H

20H

SLA+W has been transmitted;
NOT ACK has been received.

28H

Data byte in S1DAT has been transmitted;
ACK has been received.

Data byte in S1DAT has been transmitted;
NOT ACK has been received.

30H

(STA,STO,SI,AA)=(0,0,0,X)
Data byte will be transmitted;
ACK will be received.

(STA,STO,SI,AA)=(1,0,0,X)
A repeated START will be transmitted.

(STA,STO,SI,AA)=(0,1,0,X)

A STOP followed by a START will be
transmitted;
STO flag will be reset.

(STA,STO,SI,AA)=(1,1,0,X)

To Master/Receiver (A)

(STA,STO,SI,AA)=(0,0,0,X)

SLA+R will be transmitted;
ACK bit will be received;
SIO1 will be switched to MST/REC mode.

Send a STOP

followed by a START

38H

Arbitration lost in SLA+R/W
or Data bytes.

(STA,STO,SI,AA)=(0,0,0,X)
I2C bus will be released;
Not addressed SLV mode will be entered.

(STA,STO,SI,AA)=(1,0,0,X)
A START will be transmitted when
the bus becomes free.

Enter NAslave

Send a START

when bus becomes free

08H

A START has been
transmitted.

10H

A repeated START has been
transmitted.

From Slave Mode (C)

A STOP will be transmitted;
STO flag will be reset.

Preliminary W78E378/W78C378/W78C374

- 22 -

Master/Receiver Mode

(STA,STO,SI,AA)=(0,0,0,X)

SLA+R will be transmitted;
ACK will be received.

50H

Data byte has been received;
ACK has been returned.

SLA+R has been transmitted;
ACK has been received.

40H

From Master/Transmitter (A)

To Master/Transmitter (B)

58H

Data byte has been received;
NOT ACK has been returned.

SLA+R has been transmitted;
NOT ACK has been received.

48H

Set STA to generate
a START.

08H

A START has been
transmitted.

38H

Arbitration lost in NOT ACK bit.

(STA,STO,SI,AA)=(0,0,0,X)
I2C bus will be released;
Not addressed SLV mode will be entered.

Enter NAslave

(STA,STO,SI,AA)=(1,0,0,X)
A START will be transmitted
when the bus becomes free.

Send a START

when bus becomes free

(STA,STO,SI,AA)=(0,0,0,0)
Data byte will be received;
NOT ACK will be returned.

(STA,STO,SI,AA)=(0,0,0,1)
Data byte will be received;
ACK will be returned.

10H

A repeated START has been
transmitted.

(STA,STO,SI,AA)=(0,0,0,X)

SLA+W will be transmitted;
ACK will be received;
SIO1 will be switched to MST/TRX mode.

(STA,STO,SI,AA)=(1,0,0,X)
A repeated START will be transmitted.

(STA,STO,SI,AA)=(0,1,0,X)
A STOP will be transmitted;
STO flag will be reset.

(STA,STO,SI,AA)=(1,1,0,X)
A STOP followed by a START will
be transmitted;
STO flag will be reset.

Send a STOP

followed by a START

From Slave Mode (C)

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 23 - Revision A1

Slave/Transmitter Mode

A8H

Own SLA+R has been received;
ACK has been returned.

B0H

Arbitration lost in SLA+R/W as master;
Own SLA+R has been received;
ACK has been returned.

C8H

Last data byte in S1DAT has been transmitted;
ACK has been received.

B8H

Data byte in S1DAT has been transmitted;
ACK has been received.

C0H

Data byte or Last data byte in S1DAT has
been transmitted;
NOT ACK has been received.

(STA,STO,SI,AA)=(0,0,0,1)

Data byte will be transmitted;
ACK will be received.

(STA,STO,SI,AA)=(0,0,0,0)

Last data byte will be transmitted;
ACK will be received.

(STA,STO,SI,AA)=(0,0,0,1)
Data byte will be transmitted;
ACK will be received.

(STA,STO,SI,AA)=(0,0,0,0)
Last data byte will be transmitted;
ACK will be received.

Set AA

(STA,STO,SI,AA)=(1,0,0,1)
Switch to not addressed SLV mode;
Own SLA will be recognized;
A START will be transmitted when
the bus becomes free.

(STA,STO,SI,AA)=(1,0,0,0)
Switch to not addressed SLV mode;
No recognition of own SLA;
A START will be transmitted when
the bus becomes free.

(STA,STO,SI,AA)=(0,0,0,1)
Switch to not addressed SLV mode;
Own SLA will be recognized.

(STA,STO,SI,AA)=(0,0,0,0)
Switch to not addressed SLV mode;
No recognition of own SLA.

Enter NAslave

Send a START

when bus becomes free

To Master Mode (C)

Preliminary W78E378/W78C378/W78C374

- 24 -

88H

Previously addressed with own SLA address;
Data has been received;
NOT ACK has been returned.

60H

Own SLA+W has been received;
ACK has been returned.

68H

Arbitration lost in SLA+R/W as master;
Own SLA+W has been received;
ACK has been returned.

Slave/Receiver Mode

A0H

A STOP or repeated START has been
received while still addressed as SLV/REC.

80H

Previously addressed with own SLA address;
Data has been received;
ACK has been returned.

(STA,STO,SI,AA)=(0,0,0,0)
Data will be received;
NOT ACK will be returned.

(STA,STO,SI,AA)=(0,0,0,1)

Data byte will be received;
ACK will be returned.

(STA,STO,SI,AA)=(0,0,0,0)

Data byte will be received;
NOT ACK will be returned.

Set AA

(STA,STO,SI,AA)=(1,0,0,1)
Switch to not addressed SLV mode;
Own SLA will be recognized;
A START will be transmitted when
the bus becomes free.

(STA,STO,SI,AA)=(1,0,0,0)
Switch to not addressed SLV mode;
No recognition of own SLA;
A START will be transmitted when
the bus becomes free.

(STA,STO,SI,AA)=(0,0,0,1)
Switch to not addressed SLV mode;
Own SLA will be recognized.

(STA,STO,SI,AA)=(0,0,0,0)
Switch to not addressed SLV mode;
No recognition of own SLA.

Enter NAslave

Send a START

when bus becomes free

To Master Mode (C)

(STA,STO,SI,AA)=(0,0,0,1)
Data will be received;
ACK will be returned.

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 25 - Revision A1

Parabola Interrupt Generator

The parabola interrupt generator is a 13-bit auto-reload timer, which generates an interrupt to the
CPU periodically for software to load the parabola waveform data to the dynamic DACs
(DAC8

DAC10). The software should calculate the value of the PARAH and PARAL registers by:

(Vcount

16)

segment number. The segment number is the number of integration segments

between two Vsync pulses. The interrupt interval is programmable:

Time base = 1/Fosc

Programmable interrupt period = Time base

(PARAH

256 + PARAL + 1)

Maximum period = Time base

8192

Note: Zero value in [PARAH, PARAL] is inhibited.

A-to-D Converter (ref. Application Note in Appendix A.)
One 4-bit Analog-to-Digital Converter.

Conversion time = (6/Fosc)

128 sec.

7 channels selected by an analog multiplexer

(ADCS2, ADCS1, ADCS0) (0, 0, 0) (0, 0, 1) (0, 1, 0)

(0, 1, 1) (1, 0, 0) (1, 0, 1) (1, 1, 0)

Selected Channel

ADC0

ADC1

ADC2

ADC3

ADC4

ADC5

ADC6

The conversion of the ADC is started by setting bit ADCSTRT in CTRL1 by software. When the
conversion is completed, the ADCSTRT bit is cleared by hardware automatically, and the ADCINT bit
in INTVECT is set by hardware at the same time if MADCINT in INTMSK is set.

PWM DACs
Eight 8-bit Static DACs: DAC0

DAC7

The PWM frequency F

PWM

= Fosc ÷ 255

The duty cycle of the PWM output = Register value ÷ 255

The DC voltage after the low pass filter = V

duty cycle

Static DAC application circuit:

Static DAC

Low-pass filter

OUTPUT

T = RC
V

OUTPUT

= V

¡Ñn/255, if T >> T

PWM

Preliminary W78E378/W78C378/W78C374

- 26 -

Three 8-bit Dynamic DACs: DAC8

DAC10

The dynamic DACs are especially used to generate parabola waveform for geometric compensation,
or to be used as static DACs. Dynamic DAC application circuit:

Dynamic DAC

output

100K

470

+Vsync

0.022u

10u/50V

470

10K

4.7u/16V

VDD

The following types of distoration can be compensated:

1. H size distortion:

a. PinCushion Correction (Amplitude)

b. Trapezoid (Keystone)

c. CBOW (Quarter Width)

25%

d. PinCushion Correction (Corner)

e. S Curve

The PCC amplitude can be compensated against V size adjustment automatically.

The Trapzoid can be compensated against V center adjustment automatically.

2. H center distortion:

a. Pin balance (Bow)

b. Key balance (Tilt)

c. Corner balance

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 27 - Revision A1

Sync Processor

Polarity Detector

The H/V polarity is detected automatically and can be known from HPOL bit (HFCOUNTH.7) and
VPOL bit (VFCOUNTH.7).

Fosc

10 MHz

Max. H+V width

(64/Fosc)

62 (counter overflow) = 396.8

Max. V width

(2048/Fosc)

2 = 409.6

Sync Separator

The Vsync is separated from the composite sync automatically, without any software effort.

Fosc

10 MHz

Min. V width & Max. H width

(1/Fosc)

64 = 6.4

Horizontal & Vertical Frequency Counter

There are two 12-bit counters which can count H and V frequency automatically. When VEVENT
(Vsync frequency counter timeout) interrupt happens, the count value values are latched into the
counter registers (HFCOUNTH, HFCOUNTL, VFCOUNTH and VFCOUNTL). And then the S/W may
read the count value (H

COUNT

and V

COUNT

) from the counter registers to calculate the H and V

frequency by the formulas listed below.

V frequency:

The resolution of V frequency counter: V

RESOL

= (1/Fosc)

64.

The V frequency: V

FREQ

= 1/(V

COUNT

RESOL

The lowest V frequency can be detected: Fosc ÷ 262144. (38.1Hz @Fosc =10 MHz)

H frequency:
The resolution of H frequency counter: H

RESOL

= (1/Fosc)

The H frequency: H

FREQ

= 1/(H

COUNT

RESOL

The lowest H frequency can be detected: Fosc

512. (19.5 KHz @Fosc = 10 MHz)

Dummy Frequency Generator

The Dummy H and V frequencies are generated for factory burn-in or showing warning message
while there are no input frequency.

(HDUMS1, HDUMS0)

(0, 0)

(0, 1)

(1, 0)

(1, 1)

dummyH

Fosc/(8

Hsync width

4)/Fosc

2)/Fosc

3)/Fosc

5)/Fosc

VDUMS

dummyV

dummyH

/ 512

dummyH

/1024

Vsync width

8/ F

dummyH

16/ F

dummyH

Preliminary W78E378/W78C378/W78C374

- 28 -

Hdummy

.....

Vdummy

Vsync width

Hsync width

1/FdummyH

1/FdummyV

For Fosc = 10 MHz:

(HDUMS1,

HDUMS0)

(0, 1)

(1, 0)

(0, 0)

(1, 1)

dummyH

78.125 KHz

52.083 KHz

39.063 KHz

31.250 KHz

Hsync width

1.6

2.4

3.2

4.0

VDUMS

dummyV

152.6 Hz

76.3 Hz 101.7 Hz 50.9 Hz 76.3 Hz 38.1 Hz 61.0 Hz 30.5 Hz

H-clamp Pulse Generator

1. Leading edge/Trailing edge selectable.

* HCES = 0: select leading edge

* HCES = 1: select trailing edge

Negative polarity Hsync

Postive polarity Hsync

(Leading-edge)

(Trailing-edge)

(Leading-edge)

(Trailing-edge)

Hclamp

Hsync

Hclamp

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 29 - Revision A1

2. Pulse width selectable.

For Fosc = 10 MHz:

HCWS = 0

HCWS = 1

Pulse Width

500

600 nS

900

1000 nS

Safe Operation Area (SOA) Interrupt

Upper boundary frequency = F

OSC

/ [8

SOARH]

Lower boundary frequency = F

OSC

/ [8

(SOARL + 1)]

Function description:

If the condition, H

FREQ

lower than the lower boundary freq.

or higher than the upper boundary freq.,

happens twice continuously, the SOAINT will be activated.

If the HIN is stopped for a certain period, the SOAINT will also be generated.

The no Hsync response time is 512/F

OSC

. (e.x., 51.2us for 10 MHz)

If SOAHDIS = 1, then no upper boundary frequency.

Half Hsync Output

When ENHFO (bit 0 of CTRL3) is set, P4.7 (HFO) will output the same or half frequency from P4.0
(HFI). The divide-by-two operation is done at the falling edge of HFI signal when HFO_HALF (bit 3 of
CTRL3) is set. The polarity of HFO is specified by HF_POL (bit 2 of CTRL3).

HFI

HFO
(HFO_HALF=0)
(HF_POL=1)

HFO
(HFO_HALF=0)
(HF_POL=0)

HFO
(HFO_HALF=1)

Preliminary W78E378/W78C378/W78C374

- 30 -

Interrupts

The five interrupt sources are listed as below.

SOURCE VECTOR ADDRESS

DESCRIPTON

PRIORITY WITHIN A LEVEL

IE0

0003H

Interrupt 0 edge detected

Highest

TF0

000BH

Timer 0 overflow

IE1

0013H

Miscellaneous interrupts

TF1

001BH

Timer 1 overflow

SI1+SI2

002BH

SIO1 or SIO2 interrupt

Lowest

Note: *1: SCLINT + ADCINT + DDC1INT + SOAINT + VEVENT + PARAINT.

The miscellaneous interrupts at vector address 0013H is driven by the following six sources, which
are:

(1) SCLINT: when high-to-low transition on SCL-pin,

(2) ADCINT: when A-to-D conversion completion,

(3) DDC1INT: when DDC1 data byte transmitted (after 9 clock pulses from V

) in the DDC port,

(4) SOAINT: when SOA activated,

(5) VEVENT: on every Vsync pulse or vertical frequency counter overflow,

(6) PARAINT: when parabola timer timeout.

If IE1 interrupt occurs, it is necessary for the programmer to read the INTVECT register to tell where
the interrupt request comes. These sources can be masked individually by clearing their
corresponding bits in the INTMSK register. To clear any of these interrupt flags, just write a '1' to the
corresponding bit in the INTCLR.

The interrupt enable bits and priority control bits for these five main sources are listed as below.

INTERRUPT FLAG

ENABLE BIT

PRIORITY CONTROL BIT

IE0

IE.0 & IE.7

IP.0

TF0

IE.1 & IE.7

IP.1

IE1

IE.2 & IE.7

IP.2

TF1

IE.3 & IE.7

IP.3

SI+SI2

IE.5 & IE.7

IP.5

Preliminary W78E378/W78C378/W78C374

- 32 -

Reset Circuit- Power-low Detector & Watchdog Timer

The reset signals come from the following three sources:

1. External reset input (active low)

2. Power low detect

3. Hardware Watchdog Timer

The power-low detection circuit generates a reset signal once the V

falls below 3.5V for above 10

S or falls below 1.8V, and the reset signal is released after V

goes up to 4.3V.

4.3V

3.8V

1.8V

VCC

Power-low Reset

10uS

The purpose of a watchdog timer is to reset the CPU if the user program fails to reload the watchdog
timer within a reasonable period of time known as the "watchdog interval". The clock source of the
watchdog timer comes from the internal system clock. It can be enabled/disabled by set/clear

WDTEN (bit 5 of CTRL2). For debug purpose, if the WDT reset or power low reset occur, the RESET
pin will be pulled low internally. The pulled-low duration due to WDT reset is about 60/Fosc sec. The
block diagram of the reset circuitry is shown as below.

Watchdog
Timer

Power-low
Supervisor

WDTEN

Reset Logic

R:100K

C:0.01u

External Reset

/RESET

Iol=12mA @Vol=0.45V

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 33 - Revision A1

ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings

PARAMETER

SYMBOL

MIN.

MAX.

UNIT

DC Power Supply

-0.3

+7.0

Input Voltage

-0.3

+0.3

Input Current

-100

+100

Operating Temperature

Storage Temperature

TST

-55

150

Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the

device.

D.C. Characteristics

-V

= 5V

10%, T

= 25

C, Fosc = 10 MHz, unless otherwise specified.

PARAMETER

SYM.

SPECIFICATION

UNIT

TEST CONDITIONS

MIN.

TYP. MAX.

Operating Voltage

4.5

5.5

All function must pass!

Operating Current

No load, V

= 5.5V

Power-down Current

100

No load, V

= 5.5V

Input

Input Current

P2, P3.2

P3.4, P4.0

IN1

-75

-10

+10

= 5.5V, V

= 0V

= 5.5V, V

= 5.5V

Input Current RESET

IN2

-300

-10

-100

+10

= 5.5V, V

= 0V

= 5.5V, V

= 5.5V

Input Leakage Current

P1, P2.4

P2.7

(

S.F. enabled)

P3.0, P3.1, P3.5

P3.7,

P4.4, P4.5 H

, V

-10

+10

= 5.5V, 0V<V

Logical 1-to-0 Transition
Current
P2, P3.2

P3.4

-650

-100

= 5.5V, V

= 2.0V

Input Low Voltage

P1, P2, P3 (except P3.0 &
P3.1), P4.0, H

, V

RESET , OSCIN

IL1

0.8

= 4.5V

Preliminary W78E378/W78C378/W78C374

- 34 -

D.C. Characteristics, continued

PARAMETER

SYM.

SPECIFICATION

UNIT

TEST CONDITIONS

MIN.

TYP. MAX.

Input Low Voltage

P3.0, P3.1, P4.4, P4.5

IL2

0.3

= 4.5V

Input High Voltage

P1, P2, P3

(except P3.0 &

P3.1), P4.0, H

, V

, RESET

IH1

2.0

+0.2

= 5.5V

Input High Voltage

P3.0, P3.1, P4.4, P4.5

IH2

0.7

+0.2

= 5.5V

Input High Voltage

OSCIN

IH3

3.5

+0.2

= 5.5V

Output

Output Low Voltage

P1.0, P1.1, RESET

OL1

0.45

= 4.5V

= +12 mA

Output Low Voltage

P3.0, P3.1, P4.4, P4.5

OL2

0.45

= 4.5V

= +8 mA

Output Low Voltage

P1 (except P1.0 & P1.1)

P2, P3 (except P3.0

P3.2)

P4 (except P4.4 & P4.5)

OL3

0.45

= 4.5V

= +4 mA

Output Low Voltage

P3.2, OSCOUT

OL4

0.45

= 4.5V

= +0.8 mA

Output High Voltage

P2, P3.2

P3.4

OH1

2.4

= 4.5V

= -100

Output High Voltage

P4 (except P4.4 & P4.5)

OH2

2.4

= 4.5V

= -4 mA

Special Function Output
High Voltage

P2.0

P2.3, P3.3, P3.4

OH3

2.4

= 4.5V

= -4 mA

Output High Voltage

OSCOUT

OH4

2.4

= 4.5V

= -3 mA

Notes:

*1. RESET has an internal pull-up resistor of about 30 K

*2. P2 and P3.2

P3.4 can source a transition current when they are being externally driven from 1 to 0. The transition current

reaches its maximum value when V

is approximately 2V.

*3. P3.0, P3.1, P4.4, P4.5, H

, V

and RESET are Schmitt trigger inputs.

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 35 - Revision A1

Appendix A. Application Note for Usage of ADC

To use the ADC, users should pay attention to the following points:

(1) According to the absolute maximum ratings, the input voltage should not exceed V

+0.3V,

especially for the ADC channel pins (P2.4

P2.7 & P3.5

P3.7). If a voltage over V

+0.3V exists

on any of these ADC channel pins, the AD conversion will fail.

(2) Owing to the CMOS process, the ADC curve of some chip might differ from those of the others.

So, before using the ADC, the S/W should do the ADC calibration described below.

Step 1. Set (ADCS2, ADCS1, ADCS0, ADCcal) = (1, 1, 1, 0) and then do AD coversion to get

the ADC value for the on-chip

0.948V

input. Suppose it is

Step 2. Set (ADCS2, ADCS1, ADCS0, ADCcal) = (1, 1, 1, 1) and then do AD coversion to get

the ADC value for the on-chip

2.924V

input. Suppose it is

Step 3. Because the ADC curve in the usable range is linear, any

and

should

meet the

formula:

(X-A)/(V-0.948) = (B-A)/(2.924-0.948)

where

is the key voltage (designed by users and thus known) and

is its predicted

ADC value. Then, we can get

X = A + (V-0.948)(B-A)/(2.924-0.948)

, regardless of V >

0.948V or < 0.948V. (

Of course, some effort should be paid in S/W to find

Step 4. Suppose there are N keys used, the N predicted ADC values for these keys can be

found.

1.0

2.0

3.0

4.0

5.0

ADC input voltage

ADC value

Usable range
(is linear)

After finding these N predicted ADC values, the S/W can recognize which key is pressed by
comparing the ADC value of this key with the set of predicted values (found previously).

** Note: To get the exact on-chip calibration voltages (0.948V and 2.924V), the V

should be 5.0V as close as possible.

Preliminary W78E378/W78C378/W78C374

Publication Release Date: December 1999

- 37 - Revision A1

PACKAGE DIMENSIONS

32-pin P-DIP

1. Dimensions D Max. & S include mold flash or

tie bar burrs.

2. Dimension E1 does not include interlead flash.
3. Dimensions D & E1 include mold mismatch and

are determined at the mold parting line.

6. General appearance spec. should be based on

final visual inspection spec.

1.37

1.22

0.054

0.048

Notes:

Symbol

Min. Nom. Max.

Max.

Nom.

Min.

Dimension in inches

Dimension in mm

c
D

A
A

0.050

1.27

0.210

5.33

0.010

0.150

0.016

0.155

0.018

0.160

0.022

3.81

0.41

0.25

3.94

0.46

4.06

0.56

0.008

0.120

0.670

0.010

0.130

0.014

0.140

0.20

3.05

0.25

3.30

0.36

3.56

0.555

0.550

0.545

14.10

13.97

13.84

17.02

15.24

14.99

15.49

0.600

0.590

0.610

2.29

2.54

2.79

0.090

0.100

0.110

1.650

1.660

41.91

42.16

0.085

2.16

0.650

0.630

16.00

16.51

protrusion/intrusion.

4. Dimension B1 does not include dambar

5. Controlling dimension: Inches

Seating Plane

Base Plane

40-pin DIP

Seating Plane

1. Dimension D Max. & S include mold flash or

tie bar burrs.

2. Dimension E1 does not include interlead flash.
3. Dimension D & E1 include mold mismatch and

are determined at the mold parting line.

6. General appearance spec. should be based on

final visual inspection spec.

1.372

1.219

0.054

0.048

Notes:

Symbol

Min. Nom.

Max.

Nom.

Min.

Dimension in inch

Dimension in mm

0.050

1.27

0.210

5.334

0.010

0.150

0.016

0.155

0.018

0.160

0.022

3.81

0.406

0.254

3.937

0.457

4.064

0.559

0.008

0.120

0.670

0.010

0.130

0.014

0.140

0.203

3.048

0.254

3.302

0.356

3.556

0.540

0.550

0.545

13.72

13.97

13.84

17.01

15.24

14.986

15.494

0.600

0.590

0.610

2.286

2.54

2.794

0.090

0.100

0.110

2.055

2.070

52.20

52.58

0.090

2.286

0.650

0.630

16.00

16.51

protrusion/intrusion.

4. Dimension B1 does not include dambar

5. Controlling dimension: Inches.

Base Plane

Preliminary W78E378/W78C378/W78C374

- 38 -

Package Dimensions, continued

44-pin PLCC

E H

Seating Plane

Notes:

Symbol

Min.

Nom.

Max.

Nom.

Min.

Dimension in inches

Dimension in mm

on final visual inspection spec.

4. General appearance spec. should be based

3. Controlling dimension: Inches

protrusion/intrusion.

2. Dimension b1 does not include dambar

1. Dimension D & E do not include interlead flash.

0.020

0.145

0.026

0.016

0.008

0.648

0.590

0.680

0.090

0.150

0.028

0.018

0.010

0.653

0.610

0.690

0.100

0.050

BSC

0.185

0.155

0.032

0.022

0.014

0.658

0.630

0.700

0.110

0.004

0.51

3.68

0.66

0.41

0.20

16.46

14.99

17.27

2.29

3.81

0.71

0.46

0.25

16.59

15.49

17.53

2.54

1.27

4.70

3.94

0.81

0.56

0.36

16.71

16.00

17.78

2.79

0.10

BSC

16.71

16.59

16.46

0.658

0.653

0.648

16.00

15.49

14.99

0.630

0.610

0.590

17.78

17.53

17.27

0.700

0.690

0.680

b
c
D

A
A

Headquarters

No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: 886-3-5770066
FAX: 886-3-5792766
http://www.winbond.com.tw/
Voice & Fax-on-demand: 886-2-27197006

Taipei Office

11F, No. 115, Sec. 3, Min-Sheng East Rd.,
Taipei, Taiwan
TEL: 886-2-27190505
FAX: 886-2-27197502

Winbond Electronics (H.K.) Ltd.

Rm. 803, World Trade Square, Tower II,
123 Hoi Bun Rd., Kwun Tong,
Kowloon, Hong Kong
TEL: 852-27513100
FAX: 852-27552064

Winbond Electronics North America Corp.
Winbond Memory Lab.
Winbond Microelectronics Corp.
Winbond Systems Lab.

2727 N. First Street, San Jose,
CA 95134, U.S.A.
TEL: 408-9436666
FAX: 408-5441798

Note: All data and specifications are subject to change without notice.

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: W78C378P