298
Data Shift Instructions Section 3-8
Description RLNL(576) shifts all bits of Wd and Wd +1 to the left (from rightmost bit to left-
most bit). The contents of the leftmost bit of Wd +1 is shifted to the rightmost
bit of Wd, and to the Carry Flag (CY).
Flags
Precautions When RLNL(576) is executed, the Error Flag will turn OFF.
If as a result of the shift the contents of Wd and Wd +1 are zero, the Equals
Flag will turn ON.
If as a result of the shift the contents of the leftmost bit of Wd + 1 is 1, the Neg-
ative Flag will turn ON.
Examples When CIO 0.01 is ON, word CIO 1100 and CIO 1101 will shift one bit to the
left (excluding the Carry Flag (CY)). The contents of CIO 1101.15 will be
shifted to CIO 1100.00.
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
Wd+1 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 ON when the leftmost bit is 1 as a result of the shift.
OFF in all other cases.
0.01
1100
1
Wd
Instruction executed once
Wd: CIO 1100Wd+1: CIO 1101
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