Mitsubishi MELSEC Q Series Programming Manual page 416

DROR(P),DRCR(P)
DRCR
(1) Rotates 32-bit data, including carry flag, at device designated by
The carry flag goes ON or OFF depending on its status prior to the execution of the DRCR
instruction.
(2) When a bit device is designated for
specified by digit specification. The number of bits by which a rotation is executed is the
remainder of n /(specified number of bits).
For example, when n
1 is "7", and the data is rotated 7 bits.
(3) Specify any of 0 to 31 as n. If the value specified as n is 32 or greater, the remainder of n /
32 is used for rotation. For example, when n
right since the remainder of 34 / 32
Operation Error
(1) There are no operation errors associated with the DROR(P) or DRCR(P) instruction.
Program Example
(1) The following program rotates the contents of D0 and D1, not including the carry flag, 4 bits
to the right when XC is ON.
[Ladder Mode]
[Operation]
D0, D1 0
D0, D1 1
Contents of b3 to b0
before execution
7-42
D +1
b31 b30 b29 b28 b27 b18 b17
n-bit rotation
31 and (specified number of bits)
b31 b28 b27 b24 b23 b20 b19 b16
0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
b31 b28 b27 b24b23 b20b19 b16
1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
Contents of b31 to b4
before execution
D
b16 b15b14 b5 b4 b3 b2
, a rotation is performed within the device range
D
34, the contents are rotated two bits to the
1 is "2".
[List Mode]
Step Instruction
b15 b12 b11 b8 b7 b4 b3 b0
b15 b12 b11 b8 b7 b4 b3 b0
n bits to the right.
D
Carry flag
(SM700)
b1 b0
24 bits, the remainder of 31/24
Device
Carry flag
(SM700)
0
Carry flag
(SM700)
1
Content of b3
before execution