參數(shù)資料
型號(hào): 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): 87/141頁
文件大?。?/td> 374K
代理商: ΜPD703008
75
CHAPTER 5 INSTRUCTION
SHR
Shift Logical Right
Instruction format
(1) SHR reg1, reg2
(2) SHR imm5, reg2
Operation
(1) GR [reg2]
GR [reg2] logically shift right by GR [reg1]
(2) GR [reg2]
GR [reg2] logically shift right by zero-extend (imm5)
Format
(1) Format IX
(2) Format II
Op code
15
0 31
16
(1)
rrrrr111111RRRRR 0000000010000000
15
0
(2)
rrrrr010100iiiii
Flag
CY
1 if the bit shifted out last is 1; otherwise, 0.
However, if the number of shifts is 0,the result is 0.
0
1 if the result of an operation is negative; otherwise, 0.
1 if the result of an operation is 0; otherwise, 0.
OV
S
Z
SAT
Instruction
(1) SHR Shift Logical Right by Register
(2) SHR Shift Logical Right by Immediate (5-bit)
Explanation
(1) Logically shifts the word data of general register reg2 to the right by ‘n’ positions where
‘n’ is a value from 0 to +31, specified by the lower 5 bits of general register reg1 (0 is shifted
to the MSB side). This instruction then writes the result to general register reg2. If the
number of shifts is 0, general register reg2 retains the same value prior to instruction
execution. The data of general register reg1 is not affected.
(2) Logically shifts the word data of general register reg2 to the right by ‘n’ positions, where
‘n’ is a value from 0 to +31, specified by the 5-bit immediate data, zero-extended to word
length (0 is shifted to the MSB side). This instruction then writes the result to general
register reg2. If the number of shifts is 0, general register reg2 retains the same value prior
to instruction execution.
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