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EM73P361AH

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73P361A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

PROGRAM EXAMPLE

To enable WDT with 3 x 213/fc detection ftime.

LDIA #0000B

OUTA P21; set WDT detection time and clear WDT counter

RESETTING FUNCTION

When CPU in normal working condition and RESET pin holds in low level for three instruction cycles at least,

then CPU begins to initialize the whole internal states, and when RESET pin changes to high level, CPU begins

to work in normal condition.

The CPU internal state during reset condition is as following table :

Hardware condition in RESET state

Program counter

Status flag

Interrupt enable flip-flop ( EI )

MASK0 ,1, 2, 3

Interrupt latch ( IL )

P10, 11, 12, 16, 21, 25, 27, 28, 29, 30

P4, 5, 6, 7, 23, 24

XIN

Initial value

000h

01h

00h

00h

00h

00h

0Fh

Start oscillation

The RESET pin is a hysteresis input pin and it has a internal pull-up resistor.

The simplest RESET circuit is connect RESET pin with a capacitor to VSS and a diode to VDD.

RESET

* This specification are subject to be changed without notice.

12.17.2001 21

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