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EM73P361AH

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73P361A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

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.

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

:

; [DP]L ← 07h

;

[DP]

M

←

07h

; [DP]H ← 07h, Load DP=777h

LDL #00h;

LDH #03h;

LDAX

; ACC ← 6h

STAMI ; RAM[30] ← 6h

LDAXI ; ACC ← 5h

STAM

; RAM[31] ← 5h

;

ORG 777h

DATA 56h;

:

DATA RAM ( 52-nibble )

There is total 52 - nibble data RAM from address 00 to 33h

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

Increment

Address

00h - 0Fh Level 0 Level 1 Level 2 Level 3

10h - 1Fh Level 4 Level 5 Level 6 Level 7

20h - 2Fh Level 8 Level 9 Level 10 Level 11

30h - 33h Level 12

ZERO- PAGE:

Stack

Zero-page

From 00h to 0Fh is the location of zero-page. It is used as the pointer in zero -page addressing mode for the

instruction of "STD #k,y; ADD #k,y; CLR y,b; CMP k,y".

PROGRAM EXAMPLE: To wirte immediate data "07h" to address "03h" of RAM and to clear bit 2 of RAM.

STD #07h, 03h ; RAM[03] ← 07h

CLR 0Eh,2 ; RAM[0Eh]2 ← 0

STACK:

There are 13 - level (maximum) stack for user using for subroutine (including interrupt and CALL). User

can assign any level be the starting stack by giving the level number to stack pointer (SP).

* This specification are subject to be changed without notice.

12.17.2001 6

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