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Chapter 5 Instruction Specifications
5-79
Item number Application instructions-9 Name Logical shift left
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
LSL (d, n) DER ERR SD V C Upper case: W
zzzz
↕
36
Lower case: DW
Instruction format Number of steps
Condition Steps
LSL (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 left (toward the upper digits) by n bits.
• “0” is set from the least significant bit to the nth bit.
• The content of the nth bit from the most significant bit is set in C (R7F0).
0
00
00
B
B
C (R7F0)
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
LSL (WR0000 ,1 )
LD X00001
AND DIF1
[
LSL (WR0000 ,1)
]
Program description
• When X00001 rises, the content of WR0000 is shifted to the left by one bit.
At this time, “0” is set in b0 and the value of b15 immediately prior to the shift is set in R7F0.
LSL (d, n)