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): 10/44頁
文件大?。?/td> 231K
代理商: EM73492
10
EM73492
4-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
* This specification are subject to be changed without notice.
7.17.1998
(4) General Flag ( GF )
GF is a one bit general purpose register which can be set, clear, test by instruction SGF, CGF and TGS.
PROGRAM EXAMPLE:
Check following arithematic operation for CF, ZF, SF
CF
-
-
-
-
-
ZF
1
0
0
0
0
SF
1
1
1
0
0
LDIA #00h;
LDIA #03h;
ADDA #05h;
ADDA #0Dh;
ADDA #0Eh;
ALU
The arithematic operation of 4 - bit data is performed in ALU unit . There are 2 flags can be affected by the
result of ALU operation, ZF and SF . The operation of ALU can be affected by CF only .
ALU STRUCTURE
ALU supported user arithematic operation function, including : addition, subtraction and rotaion.
ALU FUNCTION
(1) Addition:
For instruction ADDAM, ADCAM, ADDM #k, ADD #k,y .... ALU supports addition function.
The addition operation can affect CF and ZF. For addition operation, if the result is "0", ZF will be "1",
otherwise, not equal "0", ZF will be "0", When the addition operation has a carry-out. CF will be "1",
otherwise, CF will be "0".
EXAMPLE:
Operation
3+4=7
7+F=6
0+0=0
8+8=0
Carry
0
1
0
1
Zero
0
0
1
1
ZF CF
SF GF
ALU
DATA BUS
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