EM73880 datasheet(3/40 Pages) EMC

3 / 40 page

* This specification are subject to be changed without notice.

EM73880

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

11.30.2001

Preliminary

Symbol

Pin-type

Function

P4.1/TRGH

I/O-Q

1-bit bidirection I/O port with HTC external input

mask option :

NMOS open-drain

PMOS open-drain

low current push-pull

normal current push-pull

high current push-pull

P4(2,3)

I/O-Q

2-bit bidirection I/O port with high current source

mask option :

NMOS open-drain

PMOS open-drain

low current push-pull

normal current push-pull

high current push-pull

P8.0/WAKEUPA,

I/O-S

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

P8.2/INT0/WAKEUPC

P8.2 and IDLE releasing function

mask option :

wakeup enable, low current push-pull

wakeup enable, normal current push-pull

wakeup disable, open-drain

wakeup disable, low current push-pull

wakeup disable, normal current push-pull

P8.1(TRGB)/WAKEUPB I/O-S

2-bit bidirection I/O port with time/counter A,B external input and IDLE

P8.3(TRGA)/WAKEUPD

releasing function

mask option :

wakeup enable, low current push-pull

wakeup enable, normal current push-pull

wakeup disable, open-drain

wakeup disable, low current push-pull

wakeup disable, normal current push-pull

BZ1, BZ2

Speech output pin

VA,VB, V1, V2, V3

Connect the capacitors for LCD bias voltage

COM0~COM3

LCD common output pins

SEG0~SEG31

LCD segment output pins

TEST

Tie Vss as package type, no connecting as COB type

PIN DESCRIPTIONS

FUNCTION DESCRIPTIONS

PROGRAM ROM (8K X 8 bits)

8 K x 8 bits program ROM contains user's program and some fixed data.

The basic structure of program ROM can be divided into 6 parts.

1. Address 000h: Reset start address.

2. Address 002h - 00Ch : 6 kinds of interrupt service routine entry addresses.

3. Address 00Eh-086h :

SCALL subroutine entry address, only available at 00Eh,016h,01Eh,026h, 02Eh,

036h, 03Eh, 046h, 04Eh, 056h, 05Eh, 066h, 06Eh, 076h, 07Eh, 086h.

4. Address 000h - 7FFh : LCALL subroutine entry address

5. Address 000h - 1FFFh : Except used as above function, the other region can be used as user's program region.

6. Address 1000h - 1FFFh : Fixed data stortage area.

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