EM73362 データシートの表示（PDF） - ELAN Microelectronics

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EM73362

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73362

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

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

10h - 1Fh

20h - 2Fh

Level 4

Level 8

Level 5

Level 9

30h - 33h Level 12

Level 2

Level 6

Level 10

Level 3

Level 7

Level 11

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).

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.

* This specification are subject to be changed without notice.

10.8.2001 5

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