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EM73P461A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

PROGRAM ROM (8K X 8 bits)

EM73P461A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

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 0000h: Reset start address.

2. Address 0002h - 000Ch : 6 kinds of interrupt service routine entry addresses .

3. Address 000Eh - 0086h : SCALL subroutine entry address, only available at 000Eh, 0016h, 001Eh, 0026h, 002Eh,

0036h, 003Eh, 0046h, 004Eh, 0056h, 005Eh, 0066h, 006Eh, 0076h, 007Eh, 0086h.

4. Address 0000h - 07FFh : LCALL subroutine entry address.

5. Address 0000h - 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.

address

000h

002h

004h

006h

008h

00Ah

00Ch

00Eh

086h

800h

:

FFFh

1FFFh

8192 x 8 bits

Reset start address

INT0; External interrupt service routine entry address

HTCI; High speed timer interrupt service entry address

TRGA; Timer/counterA interrupt service routine entry address

TRGB; Timer/counter B interrupt service routine entry address

TBI; Time base interrupt service routine entry address

INT1; External interrupt service routine entry address

SCALL, subroutine call entry address

1000h

:

Bank 1

LCALL entry address

fixed data area

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.

Please note that fixed data only can be stored in 8K ROM Bank 1.

The program counter is a 13-bit binary counter. The PC can defined 8K ROM.

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.

LDAX

LDAXI

Acc ← ROM[DP]L

Acc ← ROM[DP]H,DP+1

DP is a 13-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".

* This specification are subject to be changed without notice.

12.27.2001 6

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