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參數(shù)資料
| 型號： | EM73492 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 4-Bit Micro-Controller for Telecom Product(用于通訊產(chǎn)品和家用電器，工作電壓為2.2V-5.5V的4位微控制器) |
| 中文描述： | 4位微控制器的電信產(chǎn)品（用于通訊產(chǎn)品和家用電器，工作電壓為2.2伏至5.5V的4位微控制器） |
| 文件頁數(shù)： | 5/44頁 |
| 文件大小： | 231K |
| 代理商： | EM73492 |
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EM73492
4-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
5
* This specification are subject to be changed without notice.
7.17.1998
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 two ways.
(1) 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
Acc
←
ROM[DP]
L
LDAXI
Acc
←
ROM[DP]
H
,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 "LDADPL, LDADPM, LDADPH". 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]
L
←
07h
STADPM ; [DP]
M
←
07h
STADPH
; [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;
:
(2) 5-to-8 bits data conversion instruction:
OUT12 :
IF CF=1 Port1= ROM[FF0h+RAM[HL]]
L
; Port2= ROM [FF0h+RAM[HL]]
H
IF CF=0 Port1= ROM[FE0h+RAM[HL]]
L
; Port2= ROM[FE0h+RAM[HL]]
H
5-to-8 bits data conversion instruction can read fixed data from data conversion table (FE0-FFF) out to Port1
and Port2 synchronously, the 5-bit data is composed by CF and RAM data which specified by HL, when CF=1,
the 8-bit data is located in address of FF0h+ RAM[HL] of ROM, in the other way, when CF=0, the 8-bit data
is located in address FE0h + RAM[HL] of ROM.
PROGRAM EXAMPLE : To output port1, port2 data by 5-to-8 bits data conversion instruction.
LDL #00h;
LDH #03h;
LDIA #00h;
STAM ; RAM[30]
←
00h
TTCFS; CF
←
1
OUT12;
:
:
ORG
FF0h
DATA 40h;
7Ch;
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