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Data Shift Instructions Section 3-8
Flags
Precautions When RRNC(575) is executed, the Error Flag will turn OFF.
If as a result of the shift the contents of Wd is zero, the Equals Flag will turn
ON.
If as a result of the shift the contents of the leftmost bit of Wd is 1, the Nega-
tive Flag will turn ON.
Examples When CIO 0.00 is ON, word CIO 1000 will shift one bit to the right (excluding
the Carry Flag (CY)). The contents of CIO 1000.00 will be shifted to
CIO 1000.15.
3-8-16 DOUBLE ROTATE RIGHT WITHOUT CARRY: RRNL(577)
Purpose Shifts all Wd and Wd +1 bits one bit to the right not including the Carry Flag
(CY). The contents of the rightmost bit of Wd +1 is shifted to the leftmost bit of
Wd, and to 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.
CY
0.00
1000
Wd
Instruction executed once
Wd: CIO 1000
RRNL(577)
Wd
Wd: Word
Variations Executed Each Cycle for ON Condition RRNL(577)
Executed Once for Upward Differentiation @RRNL(577)
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
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