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Chapter 5 Instruction Specifications
5-78
Item number Application instructions-8 Name Logical shift right
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
LSR (d, n) DER ERR SD V C Upper case: W
zzzz
↕
36
Lower case: DW
Instruction format Number of steps
Condition Steps
LSR (d, n) 3 45
Bit Word Double word
Usable I/O
XY
R,
M
TD, SS,
CU, CT WX WY
WR,
WM TC DX DY
DR,
DM
Constant
Other
d I/O to be shifted {{{ {{
n
Number of bits to be
shifted
{{{{ {
The constant is set in
decimal.
Function
• Shifts the contents of d to the right (toward the lower digits) by n bits.
• “0” is set from the most significant bit to the nth bit.
• The content of the nth bit from the least significant bit is set in C (R7F0).
0
00
00
B
C (R7F0)
(R7F0)
B
d
n bits
Most significant bit (MSB)
Least significant bit (LSB)
Before execution
After execution
n bits
If d is a word: Designates the shift amount, depending on the contents (0 to 15) of the lower 4 bits (b3 to b0) of n
(WX, WY, WR, WM, TC). (Upper bits are ignored and considered as “0.”)
The n (constant) can be set to 0 to 15 (decimal).
If d is a double word: Designates the shift amount, depending on the contents (0 to 31) of the lower 5 bits (b4 to b0) of n
(WX, WY, WR, WM, TC). (Upper bits are ignored and considered as “0.”)
The n (constant) can be set to 0 to 31 (decimal).
Notes
• If n is equal to “0,” the shifting is not performed. The previous state is retained in C.
Program example
X00001 DIF1
LSR (WR0000 ,1 )
LD X00001
AND DIF1
[
LSR (WR0000 ,1)
]
Program description
• When X00001 rises, the content of WR0000 is shifted to the right by one bit.
At this time, “0” is set in b15 and the value of b0 immediately prior to the shift is set in R7F0.
LSR (d, n)