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ROL, ROLP, RCL, RCLP
RCL
(1) Rotates the 16-bit data of the device designated by
The carry flag turns ON or OFF depending on its status prior to the execution of RCL instruction.
Carry flag
(SM700)
0
Carry flag
(SM700)
1
Value of b15
Carry flag
(SM700)
0
Value of b15
Carry flag
(SM700)
Value of b(16-n)
(2) When a bit device is designated for
The number of bits by which a rotation is executed is the remainder of n/(specified number of bits).
For example, when n
rotated 3 bits.
(3) Specify any of 0 to 15 as n.
If the value specified as n is 16 or greater, the remainder of n / 16 is used for rotation.
For example, when n
Operation Error
(1) There is no operation error in the ROL(P) or RCL(P) instruction.
Program Example
(1) The following program rotates the contents of D0, not including the carry flag, 3 bits to the left when XC is turned ON.
[Ladder Mode]
[Operation]
Carry flag
(SM700)
b15
1
0
Carry flag
(SM700)
b15
1
Content of b13
Content of b12
before execution
before execution
334
b15
b14 b13 b12 b11
1
0
1
0
0
b15
b14 b13 b12 b11
0
1
0
0
0
b15
b14 b13 b12 b11
1
0
0
0
0
b15
b14 b13 b12 b11
, a rotation is performed within the device range specified by digit specification.
D
15 and (specified number of bits)
18, the data is rotated 2 bits to the left since the remainder of 18/16
[List Mode]
Step
b14 b13 b12 b11b10 b9
b8
b7
1
1
1
0
0
0
0
b14 b13 b12 b11b10 b9
b8
b7
1
0
0
0
0
0
0
0
Contents of b11 to b0
before execution
, including the carry flag, n-bits to the left.
D
b10
b9
b8 b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
0
Left rotation (1 bit)
b10
b9
b8 b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
0
Left rotation (1 bit)
b10
b8 b7 b6 b5 b4 b3 b2 b1 b0
b9
0
0
0
0
0
0
0
0
Left rotation (n bits)
b10
b9
b8 b7 b6 b5 b4 b3 b2 b1 b0
12 bits, the remainder of 15/12
Instruction
Device
b6 b5 b4 b3 b2 b1
b0
0
0
0
0
0
0
0
0
D0
b6 b5 b4 b3 b2 b1
b0
0
0
0
0
0
1
1
1
D0
Contents of b15 to b13
before execution
0
0
0
D
0
0
0
D
Value of carry flag
1
0
0
D
Value of carry flag
D
1 is "3", and the data is
1 is "2".
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