Rotr (rotate right), Rotr (rotate right) -7 – IDEC MicroSmart User Manual
Page 251
13: S
HIFT
/ R
OTATE
I
NSTRUCTIONS
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13-7
ROTR (Rotate Right)
Applicable CPU Modules
Valid Operands
For the valid operand number range, see pages 6-1 and 6-2.
▲
Internal relays M0 through M1277 can be designated as S1. Special internal relays cannot be designated as S1.
The quantity of bits to rotate can be 1 through 15.
Since the ROTR instruction is executed in each scan while input is on, a pulse input from a SOTU or SOTD instruction
should be used as required.
Valid Data Types
Example: ROTR
FC4A-C10R2/C
FC4A-C16R2/C
FC4A-C24R2/C
FC4A-D20K3/S3
FC4A-D20RK1/RS1 & FC4A-D40K3/S3
X
X
X
X
X
Operand
Function
I
Q
M
R
T
C
D
Constant
Repeat
S1 (Source 1)
Data for bit rotation
—
X
▲ X — — X
—
—
bits
Quantity of bits to rotate
—
—
—
—
—
—
—
1-15
—
W (word)
I (integer)
X
—
Before rotation:
1
0
1
0
1
0
1
0 1
1
1
1
0
1
0
0
CY
M8003
MSB
LSB
S1
0
After rotation:
1
1
1
0
0
0
0 1
1
0
0
1
0
1
1
CY
M8003
MSB
LSB
S1
1
Rotate to the right
S1
*****
bits
**
When input is on, 16-bit data of the designated source operand S1 is rotated to
the right by the quantity of bits designated by operand bits.
The result is set to the source operand S1, and the last bit status rotated out is
set to a carr y (special internal relay M8003).
ROTR(W)
When
bits to rotate = 1
When a bit operand such as Q (output), M (internal relay), or R (shift register) is designated
as the source, 16 points are used.
When a word operand such as D (data register) is designated as the source, 1 point is used.
Before rotation: D20 = 13
0
0
0
0
0
0
0
0 0
0
0
1
0
0
1
1
CY
M8003
MSB
LSB
D20
After first rotation: D20 = 16387
Bits to rotate = 2
After second rotation: D20 = 53248
0
0
0
0
0
0
1
0
0 0
0
1
0
0
0
0
1
CY
M8003
MSB
LSB
D20
1
1
0
0
0
1
1
0
0 0
0
0
0
0
0
0
0
CY
M8003
MSB
LSB
D20
M8120
REP
M8120 is the initialize pulse special internal relay.
When the CPU star ts operation, the MOV (move) instruction sets 13 to
data register D20.
Each time input I1 is turned on, 16-bit data of data register D20 is rotated
to the right by 2 bits as designated by operand bits.
The last bit status rotated out is set to a carr y (special internal relay
M8003).
SOTU
I1
S1 –
13
D1 –
D20
S1
D20
bits
2
ROTR(W)
MOV(W)