Suites 2202-7, Tower 6, The Gateway,
9 Canton Road, Tsimshatsui,
Kowloon, Hong Kong
Tel: (852) 2123 3289 Fax: (852) 2123 3393
E-mail: sales@jesstech.com
Home Page: www.jesstech.com

HE84751

HE80000 SERIES

7 Mar 01

V 1.4

1 of 12

A.HE84751 Introduction

HE84751 is a member of Jess Tech HE8000 series 8-bit CMOS micro-controller. The most
important feature of this IC is that it posses 128K Bytes if Program ROM, and 384K Bytes of
Data ROM. HE84751 can share the LCD pin and I/O pin (From 2048-dot of LCD driver + 16 Bit
I/O Port ... 1280-dot of LCD driver + 40 Bit I/O Port); (Mask Option selects the combination of
the above). It built-in one internal Op-Amp, which allow it to used in different sensors like light,
speech, temperature, and humidity sensor. It has one 7-bit D/A converter and PWM output to
provide a complete speech output interface. Using the built-in 512K ROM allow massive storage
of program library, speech, graphic and documents. It can be used in mini dictionary, data bank,
mid to high level educational toy, with the used of External SRAM or Flash RAM HE84751 can
store around 160 seconds of speech data.
The HE84751 provides a very simple and effective instruction set, each instruction byte occupies
only 1.5 clocks cycle time, therefore, and it is suitable to apply in the high performance systems.

B.HE84751 Features

Operating Voltage:

2.4V � 5.2V

Operation frequency Range:

DC ~ 8MHz @ 5.0V
DC ~ 4MHz @ 2.4V

ROM size:

512K Bytes (128K Program ROM + 384K Data ROM)

RAM size:

8.75K Bytes

Dual Clock:

Normal(Fast) clock:

32.768K ~ 8MHz

Slow

clock:

32.768KHz

Operating Mode:

DUAL FASTSLOWIDLESLEEP

Built-in WATCH DOG TIMER

16~40 bi-directional I/O pins, PUSH-PULL or OPEN DRAIN output selected by mask option

Built-in an internal Op-Amp

2048~1280 LCD driver,(AB TYPE). Built-in voltage booster circuitry to step up voltage
supply for LCD, but the maximum voltage after boosting should be less than 9 V.

Built-in one 7-bit D/A Converter

Built-in one PWM output

Provides three internal and two external interrupt

Provides two 16-bit timer, one time-base timer.

Instruction Set: 32 Instructions, 4 types of Addressing Mode, 2 individual Pointer for ROM
(24-bit) and RAM (16-bit) table access.

Development Tools version: ICE 4.0

C.HE84751 Application

Suitable in LCD games, education toys, data bank, translator and some mid-to-high end
electronic products.

Interface to Light, Sound, Temperature and Humidity sensor for controlling application.

Suites 2202-7, Tower 6, The Gateway,
9 Canton Road, Tsimshatsui,
Kowloon, Hong Kong
Tel: (852) 2123 3289 Fax: (852) 2123 3393
E-mail: sales@jesstech.com
Home Page: www.jesstech.com

HE84751

HE80000 SERIES

7 Mar 01

V 1.4

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D. Pin Assignment

Pin

Pin Name

I/O

Function

Description

116
115

FXI,
FXO

B,
O

External Fast Clock pin. To
connect the Crystal or R,C
oscillation to generate
32.768KHz ~ 8MHz
system clock.

119
118

SXI,
SXO

I,
O

External Slow Clock pin .
To connect the 32.768KHz
oscillator to generate the
stable frequency for Slow
Mode, Timer clock source
and LCD display for
HE84751.

Mask Option settings :
MO_FCK/SCKN=00Slow Clock only

01Illegal
10Dual Clock
11Fast Clock only

MO_FOSCE=0Internal fast oscillation

1External fast oscillation

MO_FXTAL=0R,C oscillation for Fast Clock

1Crystal oscillation for Fast Clock

MO_SXTAL=0R,C oscillation for 32.768K Clock

1X'tal oscillation for 32.768K Clock

Program the value of OP1and OP2 to change the
operating modes (Normal, Slow, Idle and Sleep).
In Dual Clock modethe system runs in Fast Clock, only
the Timer 1 use the 32.768K clock source.

114

RSTP_N

System reset signal

Pull this pin to low level to reset the system. Besides,
Select the Mask Option (MO_PORE=1) to enable the
HE84751 internal Power-on Reset function.
In addition, the MO_WDTE is used for Watch Dog
Timer setting
MO_WDTE =0Disable Watch Dog Timer

=1Enable Watch Dog Timer

117

TSTP_P

Test Pin.

Pull the pin to high level to enter into testing mode.

129..
136

PRTC[7:0]

Port C bi-directional I/O
pin (8 pins)

Mask Option MO_CPP[7:0] to preset the output type:

MO_CPP=1 : Push-pull output

= 0 : Open-drain output.

When assigned the port to input pin, send a `1' and read
the result to get the input value.

121..
128

PRTD[7:0]

Port D bi-directional I/O
pin, (8 pins). PRTD[7:2] is
also a Wake-up pin and
PRTD[7:6] is used for
interrupt input pin.

Mask Option MO_DPP[7:0] to preset the output type:

MO_DPP=1 : Push-pull output

0 : Open-drain output.

When assigned the port to input pin, send a `1' and read
the result to get the input value.

Suites 2202-7, Tower 6, The Gateway,
9 Canton Road, Tsimshatsui,
Kowloon, Hong Kong
Tel: (852) 2123 3289 Fax: (852) 2123 3393
E-mail: sales@jesstech.com
Home Page: www.jesstech.com

HE84751

HE80000 SERIES

7 Mar 01

V 1.4

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33..
40

PRT14[7:0]/
SEG[47:40]

B/
O

Port 14 bi-directional I/O
pin, (8 pins), or it can be
shared to LCD segment
Segment[47:40]

Mask Option MO_LIO14[7:0] to select the pins are I/O
or LCD segment: 0=I/O pin, 1=LCD segment pin

When the pins are assignment to I/O pin, select the
MASK Option MO_14PP[7:0] for output type

MO_14PP=1 : Push-pull output,

0 : Open-drain output

25..
32

PRT15[7:0]/
SEG[55:48]

B/
O

Port 15 bi-directional I/O
pin, (8 pins), or it can be
shared to LCD segment
Segment[55:48]

Mask Option MO_LIO15[7:0] to select the pins are I/O
or LCD segment: 0=I/O pin, 1=LCD segment pin

When the pins are assignment to I/O pin, select the
MASK Option MO_15PP[7:0] for output type

MO_15PP=1 : Push-pull output,

0 : Open-drain output

17..
24

PRT17[7:0]/
SEG[63:56]

B/
O

Port 17 bi-directional I/O
pin, (8 pins), or it can be
shared to LCD segment
Segment[63:56]

Mask Option MO_LIO17[7:0] to select the pins are I/O
or LCD segment: 0=I/O pin, 1=LCD segment pin

When the pins are assignment to I/O pin, select the
MASK Option MO_17PP[7:0] for output type

MO_17PP=1 : Push-pull output,

0 : Open-drain output

16..1
81.96

COM[31:0] O

LCD COMmon Output

41..
80

SEG[39:0]

LCD SEGment Output

Fill data from Page 1, refer LCD and RAM map.

LC2

Charge Pump Switch 1

LC1

Charge Pump Switch 2

Refer to application circuit.

101

LV3

Charge Pump V3

100

LV2

Charge Pump V2

LV1

Charge Pump V1

Refer to application circuit.

102..
106

LR[4..0]

LCD Resister level 4 ~ 0

Refer to application circuit.

107

LVG

LCD Virtual Ground

Refer to application circuit.

138

PWMP

PWM +ve O/P pin, can
directly drive Speaker or
Buzzer for voice output.

Preset the Bit2 of VOC register: PWM =1turn on
PWM.

139

PWMN

PWM -ve O/P pin, can
directly drive Speaker or
Buzzer for voice output.

Preset the Bit2 of VOC register: PWM =1turn on
PWM.

109

D/A voice output

Preset the Bit-1 of VOC register: DA=1turn on VO.

110

DAO

D/A Output, for OP-Amp
use

Preset the Bit-1 of VOC register: AD=1turn on DAO.

111

OPIN

OPAMP Inverting I/P pin

112

OPIP

OPAMP Non-inverting I/P
pin.

113

OPO

OPAMP O/P pin

Individual built-in OP-Amp

120
137

VDD

Positive Power Input

108
140

GND

Power Ground Input

Suites 2202-7, Tower 6, The Gateway,
9 Canton Road, Tsimshatsui,
Kowloon, Hong Kong
Tel: (852) 2123 3289 Fax: (852) 2123 3393
E-mail: sales@jesstech.com
Home Page: www.jesstech.com

HE84751

HE80000 SERIES

7 Mar 01

V 1.4

4 of 12

E.LCD RAM Map

Page

SEG

[7:0]

SEG

[15:8]

SEG

[23:16]

SEG

[31:24]

SEG

[39:32]

SEG

[47:40]

SEG

[55:48]

SEG

[63:56]

COM0

00H

20H

40H

60H

80H

A0H

C0H

E0H

COM1

01H

21H

41H

61H

81H

A1H

C1H

E1H

COM2

02H

22H

42H

62H

82H

A2H

C2H

E2H

COM29

1DH

3DH

5DH

7DH

9DH

BDH

DDH

FDH

COM32

1EH

3EH

5EH

7EH

9EH

BEH

DEH

FEH

COM31

1FH

3FH

5FH

7FH

9FH

BFH

DFH

FFH

F. How to swap physical segments

The correlative method between Logic Segment and Physical Segment is as follow:

Logic Segment

Physical Segment

LS0: 0000~3FFF

PS0

LS1: 4000~7FFF

PS1

LS2: 8000~BFFF

PS0~PS15

LS3: C000~FFFF

PS0~PS15

Swapping Physical Segment through Program Segment Register (PS0, PS1) As illustrated below:

R_RS1 (R1Ch) : Read/Write Register

Write Form

X: don't care bits.

: Logical Segment 2~3Acknowledge MCU that L

is now occupied by P

Logical Segment 0,1 and Physical Segment 0,1 fix occupation.

: Physical Segment 0~15

Suites 2202-7, Tower 6, The Gateway,
9 Canton Road, Tsimshatsui,
Kowloon, Hong Kong
Tel: (852) 2123 3289 Fax: (852) 2123 3393
E-mail: sales@jesstech.com
Home Page: www.jesstech.com

HE84751

HE80000 SERIES

7 Mar 01

V 1.4

5 of 12

For example, writing xx10 0111into PS1, which means that the following Logical Segment 2 is

occupied by

Physical Segment.

Read Format:
LS3

LS3

LS23

LS2

LS3

3210 :

Output reading indicates that that Physical Segment now occupies LS3.

LS2

3210

:Output reading indicates that that Physical Segment now occupies LS2.

R_PS0 (R1Bh): Read-only Register.

Read Format:
LS1

LS1

LS03

LS0

LS1

3210

: Output reading is always 0001, and is occupied by Physical Segment 1.

LS0

3210

: Output reading is always 0000, and is occupied by Physical Segment 1.

Электронный компонент: HE84751