327
Data Shift Instructions
Section 3-9
Flags
Precautions
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.
Examples
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.
3-9-11 ROTATE RIGHT: ROR(028)
Purpose
Shifts all Wd bits one bit to the right including the Carry Flag (CY).
Ladder Symbol
Variations
Applicable Program Areas
Name
Label
Operation
Error Flag
ER
OFF
Equals Flag
=
ON when the shift result is 0.
OFF in all other cases.
Carry Flag
CY
ON when 1 is shifted into the Carry Flag (CY).
OFF in all other cases.
Negative Flag
N
ON when the leftmost bit is 1 as a result of the shift.
OFF in all other cases.
Wd+1: CIO 0101
Wd: CIO 0100
Instruction executed once
Wd
Wd: Word
ROR(028)
Wd
Variations
Executed Each Cycle for ON Condition
ROR(028)
Executed Once for Upward Differentiation
@ROR(028)
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification
Not supported
Block program areas
Step program areas
Subroutines
Interrupt tasks
OK
OK
OK
OK
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
Page 35: ......
Page 1131: ...1110 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...