Mitsubishi MELSEC Q Series, Programming Manual

Page: 372 / 816

7-32
7.2 Rotation Instructions
7.2.2 Left rotation of 16-bit data
ROL, RCL
Function
ROL(P)
(1) Rotates 16-bit data of the device specified for , not including the carry flag, n bits to the
left.
The carry flag turns ON or OFF depending on its status prior to the execution of the ROL
instruction.
(2) When a bit device is specified for , a rotation is performed within the device range of
points by digit specification.
The number of bits that rotate is the remainder of n divided by ‘number of points by digit
specification’.
For example, when n 15 and ‘number of points by digit specification’ 12 bits, the
remainder of 15/12 1 is 3, thus the data are rotated 3 bits.
(3) Specify any of 0 to 15 for n.
If the value specified for n is 16 or higher, the remainder of n divided by 16 is used for
rotation.
For example, when n 18, the remainder of 18/16 1 is 2, thus the data are rotated 2 bits
to the left.
d
b9 b15 b10 b14 b13 b12 b11 b8 b7 b6 b5 b4 b3 b2 b1 b0
b9 b15 b10 b14 b13 b12 b11 b8 b7 b6 b5 b4 b3 b2 b1 b0
b9 b15 b10 b14 b13 b12 b11 b8 b7 b6 b5 b4 b3 b2 b1 b0
b9 b15 b10 b14 b13 b12 b11 b8 b7 b6 b5 b4 b3 b2 b1 b0
0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0
C arr y f l ag
(SM700)
0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0
d
d
d
d
Va l ue of b15
C arr y f l ag
(SM700)
L eft rotat i on (1 bi t )
L eft rotat i on (1 bi t )
1
Va l ue of b15
0
1 0 0 0 0 0 0 0 0
0
0 0 0 1 0
Va l ue of b15
C arr y f l ag
(SM700)
0
Va l ue of b15
Va l ue of b(16- n )
Va l ue of b(16- n )
C arr y f l ag
(SM700)
L eft rotat i on ( n bi ts )
d