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372
Data Shift Instructions
Section 3-9
Flags
Precautions
When ASL(025) 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, CIO 0100 will be shifted one bit to the left. “0” will
be placed in CIO 010000 and the contents of CIO 010115 will be shifted to the
Carry Flag (CY).
3-9-6
DOUBLE SHIFT LEFT: ASLL(570)
Purpose
Shifts the contents of Wd and Wd +1 one bit to the left.
Ladder Symbol
Variations
Applicable Program Areas
Operand Specifications
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.
Wd
ASLL(570)
Wd
Wd
: Word
Variations
Executed Each Cycle for ON Condition
ASLL(570)
Executed Once for Upward Differentiation
@ASLL(570)
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 0000 to CIO 6142
Work Area
W000 to W510
Holding Bit Area
H000 to H510
Содержание SYSMAC CS1D-CPU**
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Страница 193: ...154 3 35 4 MOVE BIT MOVBC 568 1274 3 35 5 BIT COUNTER BCNTC 621 1276 3 35 6 GET VARIABLE ID GETID 286 1278...
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