7-16
Section
Shift Instructions
407
When the execution condition is OFF, ROL(27) is not executed. When the
execution 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 0 0 1 1 1 0 0 0 1 1 0 1
0
CY
Bit
00
Bit
15
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
executing ROL(27).
CY will be shifted into bit 00 every cycle if the undifferentiated form of ROL(27) is
used. Use the differentiated form (@ROL(27)) or combine ROL(27) with
DIFU(13) or DIFD(14) to shift just one time.
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.
7-16-6
ROTATE RIGHT – ROR(28)
Wd
: Rotate word
IR, SR, AR, DM, HR, LR
Ladder Symbols
Operand Data Areas
ROR(28)
Wd
@ROR(28)
Wd
Limitations
DM 6144 to DM 6655 cannot be used for Wd.
When the execution condition is OFF, ROR(28) is not executed. When the
execution 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 0 1 0 0 0 1 1 1 0 0 0 1
0
Bit
15
CY
Bit
00
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
execution ROR(28).
CY will be shifted into bit 15 every cycle if the undifferentiated form of ROR(28) is
used. Use the differentiated form (@ROR(28)) or combine ROR(28) with
DIFU(13) or DIFD(14) to shift just one time.
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 00.
EQ:
ON when the content of Wd is zero; otherwise OFF.
Description
Precautions
Description
Precautions
