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* This specification are subject to be changed without notice.

8.11.2000

EM73C63

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

PROGRAM EXAMPLE:

LDIA

#0011B ; volume control

OUTA

P17

LDIA

#0011B ; 600 Hz tone output

OUTA

P24

LDIA

#0001B

OUTA

P23

LDIA

#1001B ; basic frequency : 60 KHz tone output

OUTA

P30

RESETTING FUNCTION

While CPU in normal working condition and RESET pin is held in low level for three instruction cycles at least,

then CPU begins to initialize the whole internal states, 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

Initial value

Program counter

0000h

Status flag

01h

Interrupt enable flip-flop ( EI )

00h

MASK0 ,1, 2, 3

00h

Interrupt latch ( IL )

00h

P3, 9, 14, 16, 17, 19, 22,25, 26, 27, 28, 29, 30

00h

P4, 8, 17, 23, 24

0Fh

CLK, LXIN

Start oscillation

The RESET pin is a hysteresis input pin and it has a pull-up resistor available by mask option.

The simplest RESET circuit is connect RESET pin with a capacitor to V

RESET