291
Data Shift Instructions Section 3-8
Variations
Applicable Program Areas
Operand Specifications
Description ROLL(572) shifts all bits of Wd and Wd +1 including the Carry Flag (CY) to
the left (from rightmost bit to leftmost bit).
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.
Variations Executed Each Cycle for ON Condition ROLL(572)
Executed Once for Upward Differentiation @ROLL(572)
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
Area Wd
CIO Area CIO 0 to CIO 6142
Work Area W0 to W510
Holding Bit Area H0 to H510
Auxiliary Bit Area A448 to A958
Timer Area T0000 to T4094
Counter Area C0000 to C4094
DM Area D0 to D32766
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants ---
Data Registers ---
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Wd+1
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.
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