EM73P362 datasheet(5/44 Pages) EMC

5 / 44 page

This specification are subject to be changed without notice.

11.1.2001

EM73P362

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

LDAX

Acc

←

← ROM[DP]

ROM[DP]

LDAXI

Acc

←

← ROM[DP]

ROM[DP]

H,DP+1

,DP+1

DP is a 12-bit data register which can store the program ROM address to be the pointer for the ROM code data.

First, user load ROM address into DP by instruction "STADPL, STADPM, STADPH", then user can get the

lower nibble of ROM code data by instruction "LDAX" and higher nibble by instruction "LDAXI".

User's program and fixed data are stored in the program ROM. User's program is according the PC value

to send next executed instruction code. Fixed data can be read out by table-look-up instruction.

Table-look-up instruction is depended on the Data Pointer (DP) to indicate to ROM address, then to get the

ROM code data.

FUNCTION DESCRIPTIONS

PROGRAM ROM ( 3K X 8 bits )

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

The basic structure of program ROM can be divided into 4 parts.

1. Address 000h: Reset start address.

2. Address 002h - 00Ch : 5 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 - BFFh : Except used as above function, the other region can be used as user's program region.

address

3072 x 8 bits

000h

Reset start address

002h

INT0; External interrupt service toutine entry address

004h

006h

TRGA; Timer/counter A interrupt service routine entry address

008h

TRGB; Timer/counter B interrupt service routine entry address

00Ah

TBI; Time base interrupt service routine entry address

00Ch

INT1; External interrupt service routine entry address

00Eh

086h

BFFh

SCALL, subroutine call entry address

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