397
Data Shift Instructions Section 3-9
Flags
Precautions When the shift data length (N) is 0, the contents of the beginning bit will be
copied to the Carry Flag (CY), and its contents will not be changed.
Only the bits shifted into rightmost word in the shift area (i.e. leftmost word
data) will be changed.
Examples When CIO 000000 is ON, all bits from the beginning bit 2 to end of the shift
data length 11 bits (B hex), will be shifted one bit to the right, (from the left-
most bit to the rightmost bit). “0” is shifted into bit 12 of CIO 0100. The con-
tents of the rightmost bit in the shift area (bit 2 of CIO 0100) are copied into
the Carry Flag (CY).
3-9-21 SHIFT N-BITS LEFT: NASL(580)
Purpose Shifts the specified 16 bits of word data to the left by the specified number of
bits.
Ladder Symbol
Variations
Applicable Program Areas
Name Label Operation
Error Flag ER ON when C data is not between 0000 and 000F hex.
OFF in all other cases.
Carry Flag CY ON when 1 is shifted into the Carry Flag (CY).
OFF in all other cases.
0
&2
&11
C: Starting from bit 2
N: 11 bits
NASL(580)
D
C
D: Shift word
C: Control word
Variations Executed Each Cycle for ON Condition NASL(580)
Executed Once for Upward Differentiation @NASL(580)
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
To Next Page
Loading...
Need help?
General
