25

* This specification are subject to be changed without notice.

EM73P461A

EM73P461A

EM73P461A

EM73P461A

EM73P461A

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

12.27.2001

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

P10, 11,14, 16, 19, 25, 27, 28, 29, 31

00h

P4, 8, 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

V3

V2

V1

3V

1.5V

VA

VB

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

-V1

-V3

V3

V1

Vss

-V1

-V3

Frame

COM0

COM1

COM2

COM3

SEG0

SEG0-COM0

ON

SEG0-COM1

OFF

V3

V2

V1

3V

1.5V

VA

VB

V3

V2

V1

3V

1.5V

VA

VB

V3

V2

V1

3V

1.5V

VA

VB

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

-V1

-V3

V3

V1

Vss

-V1

-V3

Frame

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

V3

V1

Vss

-V1

-V3

V3

V1

Vss

-V1

-V3

Frame

V3

Vss

V3

V1

Vss

V3

Vss

-V3

Vss

-V3

Frame

V3

(6) static

(5) 1/2 duty (1/2 bias)

(4) 1/3 duty (1/2 bias)

(3) 1/4 duty (1/2 bias)

ON

OFF