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Chapter 5 Instruction Specifications
5-80
Item number Application instructions-10 Name BCD shift right
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
BSR (d, n) DER ERR SD V C Upper case: W
zzzzz 32
Lower case: DW
Instruction format Number of steps
Condition Steps
BSR (d, n) 3 40
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 right (toward the lower digits) by n digits (1 digit is equivalent to 4 bits).
• “0” is set from the most significant bit to the nth digit.
• The digits from least significant bit to the nth digit are discarded.
0
0000
0000
n digits
n digits
Most significant bit (MSB)
Least significant bit (LSB)
Before execution
After execution
Discarded
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
BSR (WR0000 ,1 )
LD X00001
AND DIF1
[
BSR (WR0000 ,1)
]
Program description
• When X00001 rises, the content of WR0000 is regarded as BCD code and shifted to the right by four bits.
At this time, the values in the lower 4 bits (b3 to b0) are deleted and “0000” is set in the upper four bits (b12 to b15).
H
1 2 3 4
0000 0001 0010 0011
0001 0010 0011 0100
Before the shift
After the shift
Deleted
Set to “0”
H 0 1 2 3
BSR (d, n)