參數(shù)資料
型號: μPD703008
廠商: NEC Corp.
英文描述: 16/32 Bit RISC Microcontrollers(16/32位RISC微控制器)
中文描述: 16/32位RISC微控制器(16/32位的RISC微控制器)
文件頁數(shù): 54/141頁
文件大?。?/td> 374K
代理商: ΜPD703008
CHAPTER 5 INSTRUCTION
42
CLR1
Clear Bit
Instruction format
CLR1 bit#3, disp16 [reg1]
Operation
adr
GR [reg1] + sign-extend (disp16)
Z flag
Not (Load-memory-bit (adr, bit#3))
Store-memory-bit (adr, bit#3, 0)
Format
Format VIII
Op code
15
0 31
16
10bbb111110RRRRR dddddddddddddddd
Flag
CY
OV
S
Z
1 if bit NO.bit#3 of memory disp16 [reg1] = 0.
0 if bit NO.bit#3 of memory disp16 [reg1] = 1.
SAT
Instruction
CLR1 Clear Bit
Explanation
Adds the data of general register reg1 to the 16-bit displacement, sign-extended to word length,
to generate a 32-bit address. Then clears the bit, specified by the bit number of 3 bits, of the
byte data referenced by the generated address. Not specified bit is not affected.
Remark
The Z flag of the PSW indicates whether the specified bit was a 0 or 1 before this instruction
is executed. It does not indicate the content of the specified bit after this instruction has been
executed.
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