EM73983 데이터 시트보기 (PDF) - ELAN Microelectronics
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EM73983 Datasheet PDF : 40 Pages
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EM73983
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
B
XA2
:
;--------------- -------------------- -------------------- -------------------- --
BANK 2
XB1 :
:
:
B
XB
:
XB2 :
:
B
XB2
:
;--------------- -------------------- -------------------- -------------------- --
BANK 3
XC1 :
:
:
B
XC
:
XC2 :
:
B
XC2
Fixed data can be read out by table-look-up instruction. Table-look-up instruction is requires the Data point
(DP) to indicate the ROM address in obtaining the ROM code data (Except bank 0) :
LDAX
LDAXI
Acc ← ROM[DP]L
Acc ← ROM[DP]H,DP+1
DP is a 12-bit data register that stores the program ROM address as pointer for the ROM code data.
User has to initially load ROM address into DP with instructions "LDADPL", and "LDADPM, LDADPH",
then then to obtain 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.
LDIA
STADPL
STADPM
STADPH
:
LDL
LDH
LDAX
STAMI
LDAXI
STAM
;
ORG
DATA
#07h;
; [DP]L ← 07h
; [DP]M ← 07h
;
[DP]
H
←
07h,
Load
DP=777h
#00h;
#03h;
; ACC ← 6h
; RAM[30] ← 6h
; ACC ← 5h
; RAM[31] ← 5h
1777h
56h;
DATA RAM ( 500-nibble )
A total 500 - nibble data RAM is available from address 000 to 1FFh
Data RAM includes the zero page region, stacks and data areas.
* This specification are subject to be changed without notice.
10.31.2000 5
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