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): 11/44頁
文件大小: 231K
代理商: EM73492
EM73492
4-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
11
7.17.1998
(2) Subtraction:
For instruction SUBM #k, SUBA #k, SBCAM, DECM... ALU supports user subtraction function . The
subtraction operation can affect CF and ZF, For subtraction operation, if the result is negative, CF will
be "0", it means a borrow out, otherwise, if the result is positive, CF will be "1". For ZF, if the result
of subtraction operation is "0", the ZF will be "1", otherwise, ZF will be "1".
EXAMPLE:
Operation
8-4=4
7-F= -8(1000)
9-9=0
Carry
1
0
1
Zero
0
0
1
(3) Rotation:
There are two kinds of rotation operation, one is rotation left, the other is rotation right.
RLCA instruction rotates Acc value to left, shift the CF value into the LSB bit of Acc and the shift out data
will be hold in CF.
MSB
LSB
RRCA instruction operation rotates Acc value to right, shift the CF value into the MSB bit of Acc and the
shift out data will be hold in CF.
MSB
LSB
PROGRAM EXAMPLE: To rotate Acc right and shift a "1" into the MSB bit of Acc .
TTCFS; CF
1
RRCA; rotate Acc right and shift CF=1 into MSB.
HL REGISTER
HL register are two 4-bit registers, they are used as a pair of pointer for the address of RAM memory and also
2 independent temporary 4-bit data registers. For some instruction, L register can be a pointer to indicate the
pin number ( Port4 - Port7 ) .
HL REGISTER STRUCTURE
ACC
CF
3 2 1 0 3 2 1 0
H REGISTER
L REGISTER
ACC
CF
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