Texas Instruments MSP430x1xx - Manual (Page 399)

Instruction Set Overview
B-49 Instruction Set Description
RRA[.W] Rotate right arithmetically
RRA.B Rotate right arithmetically
Syntax RRA dst or RRA.W dst
RRA.B dst
Operation MSB –> MSB, MSB –> MSB–1, ... LSB+1 –> LSB, LSB –> C
Description The destination operand is shifted right one position as shown in Figure B–8.
The MSB is shifted into the MSB, the MSB is shifted into the MSB–1, and the
LSB+1 is shifted into the LSB.
Figure B–8.Destination Operand—Arithmetic Right Shift
15 0
15 0
C
Byte
Word
Status Bits N: Set if result is negative, reset if positive
Z: Set if result is zero, reset otherwise
C: Loaded from the LSB
V: Reset
Mode Bits OscOff, CPUOff, and GIE are not affected.