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EM73201H

4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT

ELAN Microelectronics 

EM73201

4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT

STAMI

LDAXI

; RAM[30] ← 6h

; ACC ← 5h

Preliminary

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

Stack

Zero-page

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).

When user using any instruction of CALL or subroutine, before entry the subroutine, the previous PC address

will be saved into stack until return from those subroutines, the PC value will be restored by the data saved

in stack.

DATA AREA:

Except the special area used by user, the whole RAM can be used as data area for storing and loading general

data.

ADDRESSING MODE

(1) Indirect addressing mode:

Indirect addressing mode indicates the RAM address by specified HL register.

For example: LDAM ; Acc ← RAM[HL]

STAM ; RAM[HL] ← Acc

(2) Direct addressing mode:

Direct addressing mode indicates the RAM address by immediate data.

* This specification are subject to be changed without notice.

7.20.1999 5

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