Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 326

Data Shift Instructions
Description
Flags
Precautions
Note
Examples
Area
Data Registers
Index Registers
Indirect addressing
using Index Registers
ROR(028) shifts all bits of Wd including the Carry Flag (CY) to the right (from
leftmost bit to rightmost bit).
Wd
Name Label
Error Flag ER
Equals Flag =
Carry Flag CY
Negative Flag N
When ROR(028) 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.
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 0.00 is ON, word CIO 1000 and the Carry Flag (CY) will shift one
bit to the right. The contents of CIO 1000.00 will be shifted to the Carry Flag
(CY) and the Carry Flag contents will be shifted to CIO 1000.15.
0.00
1000
Wd
Wd: CIO 1000
Instruction executed once
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
Operation
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.
Section 3-8
Wd
293