參數(shù)資料
型號: μPD789806Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 74/125頁
文件大?。?/td> 366K
代理商: ΜPD789806Y
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
57
CMP
Compare
Byte Data Comparison
[Instruction format]
CMP dst,src
[Operation]
dst - src
[Operand]
Mnemonic
Operand (dst,src)
Mnemonic
Operand (dst,src)
CMP
A,#byte
CMP
A,!addr16
saddr,#byte
A,[HL]
A,r
A,[HL + byte]
A,saddr
[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 7, the CY flag is set to (1). In all other cases, the CY flag is
cleared to (0).
If the subtraction generates a borrow for bit 3 out of bit 4, the AC flag is set to (1). In all other cases, the AC
flag is cleared to (0).
[Description example]
CMP 0FE38H,#38H;
38H is subtracted from the contents at address FE38H and only the flags are changed
(comparison of contents at address FE38H and the immediate data).
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