AH500 Programming Manual
6-220
API Instruction code Operand
Function
0902 D ROL P
D, n
Rotating to the left
Device
X Y M S T C HC D L SM SR E PR K 16#
“$” DF
Pulse instruction 16-bit instruction (5 steps)
32-bit instruction (5 steps)
Symbol:
D
：
Device which is rotated Word/Double word
n
：
Number of bits forming a
group
Word/Double word
Explanation:
1. The values of the bits in the device specified by D are divided into groups (n bits as a group),
and these groups are rotated to the left.
2. Only the 32-bit instructions can use the 32-bit counter.
3. The operand n used in the 16-bit instruction should be within the range between 1 and 16. The
operand n used in the 32-bit instruction should be within the range between 1 and 32.
4. Generally, the pulse instructions ROLP and DROLP are used.
Example:
When X0.0 is switched from OFF to ON, the values of the bits in D10 are divided into groups (four
bits as a group), and these groups are rotated to the left. (The value of the bit marked ※ is
transmitted to the carry flag SM602.)
Carry flag
Carry flag
A
fter the rotation is executed
1
1 1 1 1 1 1 1 0 0 0 0 0 0 0
0
1 1 1
1
※
1
b0b15
b0
b15
0
0 0 0 0 0 0 0 1 1 1 1
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