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EM73982

4-BIT MICROCONTROLLER

ELAN Microelectronics 

EM73982

4-BIT MICROCONTROLLER

FUNCTION BLOCK DIAGRAM

RESET

XIN/CLK XOUT/NC

Reset

Control

Clock

Generator

Timing

Generator

System Control

Interrupt

Control

Instruction Decoder

Instruction Register

Time

Base

Timer/Counter

(TA,TB)

ROM

PC

Data pointer

ACC

ALU

Flag

ZC S

Sleep Mode

Control

Stack pointer

Stack

ROM

HR LR

LCD Driver

Voice

Synthesizer

SOUND GEN.

I/O Control

P0.0/WAKEUP0

P0.1/WAKEUP1

P0.2/WAKEUP2

P0.3/WAKEUP3

PIN DESCRIPTIONS

Symbol

Pin-type

Function

VDD

VSS

RESET

RESET-A

Power supply (+)

Power supply (-)

System reset input signal, low active

mask option :

none

pull-up

XIN/CLK

OSC-A/OSC-C Crystal/RC or external clock source connecting pin

XOUT/NC

OSC-A/OSC-C Crystal connecting pin

P0.(0..3)/WAKEUP0..3 INPUT-B

P4.0/SOUND

I/O-O

P4(1..3)

I/O-N

P8.0/WAKEUPA

I/O-L

P8.2(INT0)/WAKEUPC

4-bit input port with Sleep/Hold releasing function

mask option :

wakeup enable, pull-up

wakeup enable, none

wakeup disable, pull-up

wakeup disable, pull-down

wakeup disable, none

1-bit bidirection I/O port or inverse sound effect output

mask option :

SOUND enable, push-pull, high current PMOS

SOUND disable, open-drain

SOUND disable, push-pull, high current PMOS

SOUND disable, push-pull, low current PMOS

3-bit bidirection I/O port with high current source.

mask option :

open-drain

push-pull, high current PMOS

push-pull, low current PMOS

2-bit bidirection I/O port with external interrupt sources input only for

P8.2 and Sleep/Hold releasing function

mask option :

wakeup enable, push-pull

wakeup disable, push-pull

wakeup disable, open-drain

* This specification are subject to be changed without notice.

11.30.2001 2

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