EM73461A Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM73461A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

address

000h

002h

004h

006h

008h

00Ah

00Ch

00Eh

086h

...

FFFh

EM73461A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4096 x 8 bits

Preliminary

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

...

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 two ways.

(1) 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 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".

PROGRAM EXAMPLE: Read out the ROM code of address 777h by table-look-up instruction.

LDIA #07h;

STADPL

STADPM

STADPH

; DP3-0 ← 07h

; DP5-4 ← 07h

; DP8-6 ← 07h, Load DP=777h

:

LDL #00h;

LDH #03h;

LDAX

STAMI

LDAXI

STAM

; ACC ← 6h

; RAM[30] ← 6h

; ACC ← 5h

; RAM[31] ← 5h

;

ORG 777h

DATA 56h;

:

DATA RAM ( 244-nibble )

There is total 244 - nibble data RAM from address 00 to F3h

Data RAM includes 3 parts: zero page region, stacks and data area.

* This specification are subject to be changed without notice.

1.5.2001 4

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