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Data Shift Instructions Section 3-9
Description ASR(026) shifts the contents of Wd one bit to the right (from leftmost bit to
rightmost bit). “0” will be placed in the leftmost bit and the contents of the
rightmost bit will be shifted into the Carry Flag (CY).
Flags
Precautions When ASR(026) is executed, the Error Flag and the Negative Flag will turn
OFF.
If as a result of the shift the contents of Wd is zero, the Equals Flag will turn
ON.
Examples When CIO 000000 is ON, word CIO 0100 will shift one bit to the right. “0” will
be placed in CIO 010015 and the contents of CIO 010000 will be shifted to the
Carry Flag (CY).
3-9-8 DOUBLE SHIFT RIGHT: ASRL(571)
Purpose Shifts the contents of Wd and Wd +1 one bit to the right.
Ladder Symbol
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
Area 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 OFF
Wd
ASRL(571)
Wd: Word
Wd
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