27

* This specification are subject to be changed without notice.

EM73880

EM73880

EM73880

EM73880

EM73880

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

11.30.2001

Preliminary

Preliminary

Preliminary

Preliminary

Preliminary

RESETTING FUNCTION

RESETTING FUNCTION

RESETTING FUNCTION

RESETTING FUNCTION

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

Initial value

Program counter

0000h

Status flag

01h

Interrupt enable flip-flop ( EI )

00h

MASK0 ,1, 2, 3

00h

Interrupt latch ( IL )

00h

P4, P5, P10, 11,14, 16, 19, 25, 27, 28, 29, 31 00h

P4, 8, 17, 23, 24

0Fh

Both oscillator

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