參數(shù)資料
型號(hào): μPD789014
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): 111/125頁
文件大?。?/td> 366K
代理商: ΜPD789014
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
94
DBNZ
Decrement and Branch if Not Zero
Conditional Loop (R1
0)
[Instruction format]
DBNZ dst,$addr16
[Operation]
dst
dst - 1,
then PC
PC + b + jdisp16 if dst R1
0
[Operand]
Mnemonic
Operand (dst,$addr16)
b (Number of bytes)
DBNZ
B,$addr16
2
C,$addr16
2
saddr,$addr16
3
[Flag]
Z
AC
CY
[Description]
One is subtracted from the destination operand (dst) contents specified with the 1st operand and the
subtraction result is stored in the destination operand (dst).
If the subtraction result is not 0, data is branched to the address indicated with the 2nd operand ($addr16).
When the subtraction result is 0, no processing is carried out and the subsequent instruction is executed.
The flag remains unchanged.
[Description example]
DBNZ B,$1215H;
The B register contents are decremented. If the result is not 0, data is branched to 1215H
(with the start of this instruction set in the range of addresses 1194H to 1293H).
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