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Data Shift Instructions Section 3-9
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 000000 is ON, word CIO 0100 will shift one bit to the right (exclud-
ing the Carry Flag (CY)). The contents of CIO 010000 will be shifted to
CIO 010015.
3-9-16 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
Wd
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
Wd
Instruction executed once
Wd: CIO 0100
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
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