W541L240 Data Sheet

4-BIT MICROCONTROLLER

Publication Release Date: May 29, 2003

- 1 -

Revision A5

Table of Contents-

GENERAL DESCRIPTION ......................................................................................................... 2

FEATURES ................................................................................................................................. 2

BLOCK DIAGRAM ...................................................................................................................... 4

PIN CONFIGURATION............................................................................................................... 5

PIN DESCRIPTION..................................................................................................................... 6

ELECTRICAL CHARACTERISTICS........................................................................................... 7

6.1

Absolute Maximum Ratings .......................................................................................... 7

6.2

DC Characteristics ........................................................................................................ 7

6.3

AC Characteristics......................................................................................................... 8

APPLICATION CIRCUIT............................................................................................................. 9

REVISION HISTORY ................................................................................................................ 10

W541L240

- 2 -

1. GENERAL DESCRIPTION

The W541L240 is fully compatible with W741L240 in the terms of pin assignment and IC functon
except main oscillator. It is a high-performance 4-bit microcontroller (

µC) that provides an LCD driver.

The device contains a 4-bit ALU, a 8-bit timer, a divider, a 24

× 4 LCD driver, and three 4-bit I/O ports

(including 1 output port for LED driving). There are also three interrupt sources and 8-level subroutine
nesting for interrupt applications. The W541L240 operates on low voltage and very low current and
has two power reduction modes, hold mode and stop mode, which help to minimize power dissipation.

The W541L240 is suitable for remote controllers, watches and clocks, multiple I/O products, keyboard
controllers, speech synthesis LSI controllers, and other products.

2. FEATURES

· Operating voltage: 1.2 ~ 1.8V (LCD drive voltage: 3.0V, or 4.5V)
· Crystal/RC oscillation circuit selectable by code option for system clock
· Crystal oscillator: 32.768 KHz only
· RC oscillator: 1 MHz (maximum)

- High-frequency (400 KHz to 1 MHz) or low-frequency (below 400 KHz) oscillation option must

be determined by the code option.

- In RC mode, attention must be paid to the high/low frequency oscillation option, because the

LCD driver frequency is related to this option.

· Memory

- 2048 × 16 bit program ROM (including 2K × 4 bit look-up table)

- 64 × 4 bit data RAM (including 16 working registers)

- 24 × 4 LCD data RAM

· 13 input/output pins

- Ports for input only: 1 port/4 pins

- Input/output ports: 2 ports/8 pins

- MFP output pin: 1 pin (MFP)

- Do not be floating when it is as input or output open-drain (NMOS type).

· Power-down mode

- Hold function: no operation (except for oscillator)

- Stop function: no operation (including main clock)

· Three types of interrupts

- Two internal interrupts (Divider 0, Timer 1)

- One external interrupts (Port RC)

W541L240

Publication Release Date: May 29, 2003

- 3 -

Revision A5

· LCD driver output

- 24 segment × 4 common

- Static, 1/2 duty (1/2 bias), 1/3 duty (1/2 or 1/3 bias), 1/4 duty (1/3 bias) driving mode can be

selected

· MFP output pin

- Output is software selectable as modulating or nonmodulating frequency

- Works as frequency output specified by Timer 1

· Built-in 14-bit clock frequency divider circuit
· One built-in 8-bit programmable countdown timers

- Timer 1: Offers auto-reload function and one of two internal clock frequencies (F

OSC

or F

OSC

/64)

can be selected (output through MFP pin)

· Built-in 18/14-bit watchdog timer selectable for system reset
· Powerful instruction set: 100 instructions
· 8-level subroutine (include interrupt) nesting
· Up to 4 µS instruction cycle (with 1 MHz operating frequency)
· Packaged in 64-pin QFP

W541L240

- 4 -

3. BLOCK DIAGRAM

LCD DRIVER

STACK

(8 Levels)

RAM

(64*4)

ALU

Timing Generator

PORT RA

PORT RC

Modulation

Frequency

Pulse

SEG0 to SEG23

COM0 to COM3

RA0-3

RC0-3

MFP

XIN

XOUT

VDD
VSS

VDD1-3 DH1-2

ROM

(2048*16)

(look_up table

2K*4)

Timer 1

(8 Bit)

ACC

RES

Divider 0

(14 Bit)

HCF

PEF

HEF

IEF

Central Control

Unit

EVF

SEF

PSR0

MR1

MUL

SEL

+1(+2)

PM0

PM1

PORT RB

RB0-3

W541L240

Publication Release Date: May 29, 2003

- 5 -

Revision A5

4. PIN CONFIGURATION

47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

RC3

RC2

RC1

RC0

RB3

RB1

X
I
N

O
U
T

V
D N N
D C C

D
H
1

D
H
2

V
D
D

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

N
C

V
S
S

N
C

C
O
M

S
E
G

3 2 1 0 0 1 2 3 4 5

C C

N N

S S S

E E
G G

E
G

2 1 0 9

SEG9

SEG8

SEG7

SEG6

RB0

RA3

RA2

RA1

RB2

2 2 2 1

S
E
G

V
D
D
2

V
D
D

W541L240

- 6 -

5. PIN DESCRIPTION

SYMBOL I/O

FUNCTION

XIN I

Input pin for oscillator.
Connected to crystal or resistor to generate system clock by code option.
External 10~20pF capacitor uses to get accurate freq in crystal mode.

XOUT O

Output pin for oscillator.
Connected to crystal or resistor to generate system clock by code option.
20pF capacitor is built in internal for crystal mode...

RA0

-RA3

I/O

Input/Output port.
Input/output mode specified by port mode 1 register (PM1).

RB0

-RB3

I/O

Input/Output port.
Input/output mode specified by port mode 2 register (PM2).

RC0

-RC3

4-bit port for input only.
Each pin has an independent interrupt capability. And build-in schmitt
trigger.

MFP

Output pin only.
This pin can output modulating or nonmodulating frequency, or Timer 1
clock output specified by mode register 1 (MR1).

RES

System reset pin with pull-high resistor.

SEG0

-SEG23

LCD segment output pins.
Also can be used as DC output ports specified by code option.

COM0

-COM3

LCD common signal output pins.

Static

COM0

COM1

COM2

COM3

Used

Not Used

1/2 Duty

Not Used

1/3 Duty

Not Used

1/4 Duty

Used

The LCD alternating frequency can be selected by code option.

DH1, DH2

Connection terminals for voltage doubler (halver) capacitor.

DD1

, V

DD2

DD3

Positive (+) supply voltage terminal.
Refer to Functional Description.

Positive power supply (+).

Negative power supply (-).

W541L240

Publication Release Date: May 29, 2003

- 7 -

Revision A5

6. ELECTRICAL CHARACTERISTICS

6.1 Absolute Maximum Ratings

PARAMETER RATING

UNIT

Supply Voltage to Ground Potential

-0.3 to +7.0

Applied Input/Output Voltage

-0.3 to +7.0

Power Dissipation

120

Ambient Operating Temperature

0 to +70

°C

Storage Temperature

-55 to +150

°C

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

of the device.

6.2 DC Characteristics

-V

= 1.5V, F

OSC

. = 32.768 KHz, T

= 25

° C; unless otherwise specified)

PARAMETER

SYM.

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Op. Voltage

- 1.2

1.8

Op. Current (Crystal type)

OP1

No load (Ext-V)

µA

Op. Current (RC type)

OP2

No load (Ext-V)

µA

Hold Current (Crystal type)

HM1

Hold mode
No load (Ext-V)

- 3 6

µA

Hold Current (RC type)

HM2

Hold mode
No load (Ext-V)

- 16 40

µA

Stop Current (Crystal type)

SM1

Stop mode
No load (Ext-V)

- 0.1 2

µA

Stop Current (RC type)

SM2

Stop mode
No load (Ext-V)

- 0.1 2

µA

Input Low Voltage

- V

- 0.3

Input High Voltage

- 0.7

MFP Output Low Voltage

= 0.9mA

0.3

MFP Output High Voltage

= -0.75mA

1.2

Port RA, RB Output Low Voltage V

ABL

= 1.0mA

0.2

0.3

Port RA, RB Output Hi Voltage

ABH

= -0.5mA

1.2

1.4

LCD Supply Current

LCD

All Seg. On

µA

W541L240

- 8 -

DC Characteristics, continued

PARAMETER

SYM.

CONDITIONS

MIN.

TYP.

MAX.

UNIT

SEG0

-SEG23 Sink Current

= 0.05V

LCD

= 0.0V

6 - -

µA

SEG0

-SEG23 Drive Current

= 4.45V

LCD

= 4.5V

1.5 - -

µA

Input Port Pull-up Resistor

Port RC

200

1000

1500

RES

Pull-up Resistor

RES

- 200

500

1500

6.3 AC Characteristics

-V

= 1.5V, T

= 25

° C; unless otherwise specified)

PARAMETER

SYM.

CONDITIONS

MIN.

TYP.

MAX.

UNIT

RC type

1000

Op. Frequency

OSC

Crystal type (Option low-
speed type only)

- 32.768 - KHz

Oscillator Start-up Time

= 1.2 V,

OSC

= 32.768 KHz

- 1 2

Instruction Cycle Time

One machine cycle

4/F

OSC

- mS

Reset Active Width

RAW

OSC

= 32.768 KHz

µS

Interrupt Active Width

IAW

OSC

= 32.768 KHz

µS

W541L240

- 10 -

8. REVISION HISTORY

VERSION DATE

DESCRIPTION

A2 -

Note: Recommend working voltage range for Hi freq X all mode
( L series)

Note: RC is built-in schmitt trigger

A4 -

Note: Do not be floating when it is as input or output open-drain
(NMOS type)

May 29, 2003

Note : Update DC psec formate

Headquarters

No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: 886-3-5770066
FAX: 886-3-5665577
http://www.winbond.com.tw/

Taipei Office

TEL: 886-2-8177-7168
FAX: 886-2-8751-3579

Winbond Electronics Corporation America

2727 North First Street, San Jose,
CA 95134, U.S.A.
TEL: 1-408-9436666
FAX: 1-408-5441798

Winbond Electronics (H.K.) Ltd.

No. 378 Kwun Tong Rd.,
Kowloon, Hong Kong

FAX: 852-27552064

Unit 9-15, 22F, Millennium City,

TEL: 852-27513100

Please note that all data and specifications are subject to change without notice.

All the trade marks of products and companies mentioned in this data sheet belong to their respective owners.

Winbond Electronics (Shanghai) Ltd.

200336 China

FAX: 86-21-62365998

27F, 2299 Yan An W. Rd. Shanghai,

TEL: 86-21-62365999

Winbond Electronics Corporation Japan

Shinyokohama Kohoku-ku,
Yokohama, 222-0033

FAX: 81-45-4781800

7F Daini-ueno BLDG, 3-7-18

TEL: 81-45-4781881

9F, No.480, Rueiguang Rd.,

Neihu District, Taipei, 114,

Taiwan, R.O.C.

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: W541L240

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: W541L240