參數(shù)資料
型號: μPD784035Y
廠商: NEC Corp.
英文描述: 8/16 Bit Single Chip Microcontrollers(8/16 位微控制器)
中文描述: 8 / 16位單片機微控制器(8 / 16位微控制器)
文件頁數(shù): 78/125頁
文件大小: 366K
代理商: ΜPD784035Y
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
61
CMPW
Compare Word
Word Data Comparison
[Instruction format]
CMPW dst,src
[Operation]
dst - src
[Operand]
Mnemonic
Operand (dst,src)
CMPW
AX,#word
[Flag]
Z
AC
CY
×
×
×
[Description]
The source operand (src) specified with the 2nd operand is subtracted from the destination operand (dst)
specified with the 1st operand.
The subtraction result is not stored anywhere and only the Z, AC and CY flags are changed.
If the subtraction result is 0, the Z flag is set to (1). In all other cases, the Z flag is cleared to (0).
If the subtraction generates a borrow out of bit 15, the CY flag is set to (1). In all other cases, the CY flag is
cleared to (0).
As a result of subtraction, the AC flag becomes undefined.
[Description example]
CMPW AX,#0ABCDH;
ABCDH is subtracted from the AX register and only the flags are changed (comparison
of the AX register and the immediate data).
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