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Chapter 5 Instruction Specifications
5-81
Item number Application instructions-11 Name BCD shift left
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
BSL (d, n) DER ERR SD V C Upper case: W
zzzzz 32
Lower case: DW
Instruction format Number of steps
Condition Steps
BSL (d, n) 3 39
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 digits to be
shifted
{{{{ {
The constant is set in
decimal.
Function
• Shifts the contents of d to the left (toward the upper digits) by n digits (one digit is equivalent to 4 bits).
• “0” is set from the least significant bit to the nth digit.
• The digits from the most significant bit to the nth digit are discarded.
0
0000
d
0000
n digits
Most significant bit (MSB)
Least significant bit (LSB)
Discarded
Before execution
After execution
n digits
If d is a word: Designates the shift amount, depending on the contents (0 to 3) of the lower 2 bits (b1, 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 3 (decimal).
If d is a double word: Designates the shift amount, depending on the contents (0 to 7) of the lower 3 bits (b2 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 7 (decimal).
Notes
• If n is equal to “0,” the shifting is not performed.
Program example
X00001 DIF1
BSL (WR0000 ,1 )
LD X00001
AND DIF1
[
BSL (WR0000 ,1)
]
Program description
• When X00001 rises, the content of WR0000 is regarded as BCD code and shifted to the left by four bits.
At this time, the data of the lower four bits are deleted and “0000” is set in the upper four bits.
H 1 2 3 4 H 2 3 4 0
0010 0011 0100 0000
0001 0010 0011 0100
Deleted
Before the shift After the shift
Set to “0”
BSL (d, n)