参数资料
型号: 780964
厂商: NEC Corp.
英文描述: Common to 78K/0 Series
中文描述: 共同的78K / 0系列
文件页数: 66/129页
文件大小: 644K
代理商: 780964
66
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
User's Manual U12326EJ4V0UM
Compare Word
CMPW
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 by the 2nd operand is subtracted from the destination operand (dst)
specified by 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 (1). In all other cases, the Z flag is cleared (0).
If the subtraction generates a borrow out of bit 15, the CY flag is set (1). In all other cases, the CY flag is
cleared (0).
As a result of subtraction, the AC flag becomes undefined.
[Description example]
CMPW AX, #ABCDH;
ABCDH is subtracted from the AX register and only the flags are changed (comparison
of the AX register and the immediate data).
相关PDF资料
PDF描述
78098 Common to 78K/0 Series
78098B Common to 78K/0 Series
78044H Common to 78K/0 Series
78058F common to 78K/0 Series
780001 Common to 78K/0 Series
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