5

* This specification are subject to be changed without notice.

10.8.2001

EM73361A

EM73361A

EM73361A

EM73361A

EM73361A

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

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).

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]

Increment

Address

20h - 2Fh

30h - 33h

Level 0

Level 4

Level 8

Level 12

Level 1

Level 5

Level 9

Level 2

Level 6

Level 10

Level 3

Level 7

Level 11

00h - 0Fh

10h - 1Fh

Stack

Zero-page

DATA RAM ( 52-nibble )

DATA RAM ( 52-nibble )

DATA RAM ( 52-nibble )

DATA RAM ( 52-nibble )

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.

LDAX

LDAX

LDAX

LDAX

LDAX

Acc

Acc

Acc

Acc

Acc

←

←

←

←

← ROM[DP]

ROM[DP]

ROM[DP]

ROM[DP]

ROM[DP]

L

L

L

L

L

LDAXI

LDAXI

LDAXI

LDAXI

LDAXI

Acc

Acc

Acc

Acc

Acc

←

←

←

←

← ROM[DP]

ROM[DP]

ROM[DP]

ROM[DP]

ROM[DP]

H

H

H

H

,DP+1

,DP+1

,DP+1

,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

; [DP]

STADPM

; [DP]

STADPH

; [DP]

:

LDL #00h;

LDH #03h;

LDAX

; ACC

← 6h

STAMI

; RAM[30]

← 6h

LDAXI

; ACC

← 5h

STAM

; RAM[31]

← 5h

;

ORG 777h

DATA 56h;

:

Table-look-up instruction is depended on the Data Pointer ( DP ) to indicate to ROM address, then to get the

ROM code data.

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.