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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 69/125頁
文件大?。?/td> 366K
代理商: ΜPD789806Y
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
52
SUB
Subtract
Byte Data Subtraction
[Instruction format]
SUB dst,src
[Operation]
dst,CY
dst - src
[Operand]
Mnemonic
Operand (dst,src)
Mnemonic
Operand (dst,src)
SUB
A,#byte
SUB
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 and the result is stored in the destination operand (dst) and the CY flag.
The destination operand can be cleared to 0 by equalizing the source operand (src) and the destination
operand (dst).
If the subtraction shows that dst 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]
SUB A,D; The D register is subtracted from the A register and the result is stored in the A register.
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