Omron CS1G/H-CPUxxH Instructions Manual page 346

Data Shift Instructions
Description
Flags
Precautions
Examples
Area
Data Registers
Index Registers
Indirect addressing
using Index Registers
ROL(027) shifts all bits of Wd including the Carry Flag (CY) to the left (from
rightmost bit to leftmost bit).
Name
Error Flag ER
Equals Flag =
Carry Flag CY
Negative Flag N
When ROL(027) 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.
Note It is possible to set the Carry Flag contents to 1 or 0 immediately before exe-
cuting this instruction, by using the Set Carry (STC(040)) or Clear Carry
(CLC(041)) instructions.
When CIO 000000 is ON, word CIO 0100 and the Carry Flag (CY) will shift
one bit to the left. The contents of CIO 010015 will be shifted to the Carry Flag
(CY) and the Carry Flag contents will be shifted to CIO 010000.
DR0 to DR15
---
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Label
OFF
ON when the shift result is 0.
OFF in all other cases.
ON when 1 is shifted into the Carry Flag (CY).
OFF in all other cases.
ON when the leftmost bit is 1 as a result of the shift.
OFF in all other cases.
Wd
Wd: CIO 0100
Instruction executed once
Section 3-9
Wd
Operation
325