Omron CS1G/H-CPUxxH Instructions Manual page 348

Data Shift Instructions
Flags
Precautions
Examples
3-9-11 ROTATE RIGHT: ROR(028)
Purpose
Ladder Symbol
Variations
Applicable Program Areas
Name
Error Flag ER
Equals Flag =
Carry Flag CY
Negative Flag N
When ROLL(572) is executed, the Error Flag will turn OFF.
If as a result of the shift the contents of Wd and Wd +1 are zero, the Equals
Flag will turn ON.
If as a result of the shift the contents of the leftmost bit of Wd + 1 is 1, the Neg-
ative Flag will turn ON.
Note It is possible to set the Carry Flag contents to 1 or 0 immediately before exe-
cuting this instruction, by using the Set Carry (STC(040)) or Clear Carry
(CLC(041)) instructions.
When CIO 000000 is ON, word CIO 0100, CIO 0101 and the Carry Flag (CY)
will shift one bit to the left. The contents of CIO 010015 will be shifted to the
Carry Flag (CY) and the Carry Flag contents will be shifted to CIO 010000.
Shifts all Wd bits one bit to the right including the Carry Flag (CY).
Variations Executed Each Cycle for ON Condition
Executed Once for Upward Differentiation
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification
Block program areas
OK
Label
OFF
ON when the shift result is 0.
OFF in all other cases.
ON when 1 is shifted into the Carry Flag (CY).
OFF in all other cases.
ON when the leftmost bit is 1 as a result of the shift.
OFF in all other cases.
Wd
Wd+1: CIO 0101
ROR(028)
Wd
Step program areas
OK
Section 3-9
Operation
Wd: CIO 0100
Instruction executed once
Wd: Word
ROR(028)
@ROR(028)
Not supported
Subroutines Interrupt tasks
OK OK
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