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5-15-5 ROTATE LEFT – ROL(27)
Wd: Rotate word
IR, SR, AR, DM, HR, LR
Ladder Symbols Operand Data Areas
ROL(27)
Wd
@ROL(27)
Wd
Description When the execution condition is OFF, ROL(27) is not executed. When the exe-
cution condition is ON, ROL(27) shifts all Wd bits one bit to the left, shifting CY
into bit 00 of Wd and shifting bit 15 of Wd into CY.
1 0 1 1 0011100011010
CY
Bit
00
Bit
15
Precautions Use STC(41) to set the status of CY or CLC(41) to clear the status of CY before
doing a rotate operation to ensure that CY contains the proper status before ex-
ecution ROL(27).
The status of CY is cleared at the end of each cycle (when END(01) is executed).
Flags ER: Indirectly addressed DM word is non-existent. (Content of ∗DM word is
not BCD, or the DM area boundary has been exceeded.)
CY: Receives the data of bit 15.
EQ: ON when the content of Wd is zero; otherwise OFF.
5-15-6 ROTATE RIGHT – ROR(28)
Wd: Rotate word
IR, SR, AR, DM, HR, LR
Ladder Symbols Operand Data Areas
ROR(28)
Wd
@ROR(28)
Wd
Description When the execution condition is OFF, ROR(28) is not executed. When the exe-
cution condition is ON, ROR(28) shifts all Wd bits one bit to the right, shifting CY
into bit 15 of Wd and shifting bit 00 of Wd into CY.
0 1 0 1 0100011100010
Bit
15
CY
Bit
00
Precautions Use STC(41) to set the status of CY or CLC(41) to clear the status of CY before
doing a rotate operation to ensure that CY contains the proper status before ex-
ecution ROR(28).
The status of CY is cleared at the end of each cycle (when END(01) is executed).
Flags ER: Indirectly addressed DM word is non-existent. (Content of ∗DM word is
not BCD, or the DM area boundary has been exceeded.)
CY: Receives the data of bit 15.
EQ: ON when the content of Wd is zero; otherwise OFF.
Data Shifting Section 5-15