EM73461B 데이터 시트보기 (PDF) - ELAN Microelectronics

부품명

상세내역

제조사

EM73461B

B 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73461B

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

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 13-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 1777h by table-look-up instruction for 8K ROM.

LDIA #07h;

STADPL

STADPM

STADPH

; DP3-0 ← 07h

; DP5-4 ← 07h

; DP8-6 ← 07h, Load DP=1777h

:

LDL #00h;

LDH #03h;

LDAX

STAMI

LDAXI

STAM

; ACC ← 6h

; RAM[30] ← 6h

; ACC ← 5h

; RAM[31] ← 5h

;

BANK 1;

ORG 1777h

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.

Increment

Address

00h~0Fh

10h~1Fh

20h~2Fh

30h~3Fh

40h~4Fh

:

B0h ~ BFh

C0h ~ CFh level 0

D0h ~ DFh level 4

E0h ~ EFh level 8

F0h ~ F3h level C

zero page

LCD display RAM

level 1

level 5

level 9

level 2

level 6

level A

level 3

level17

level B

* This specification are subject to be changed without notice.

12.26.2001 6

Share Link: