SLAU367P October 2012 – April 2020 MSP430FR5041 , MSP430FR5043 , MSP430FR50431 , MSP430FR5847 , MSP430FR58471 , MSP430FR5848 , MSP430FR5849 , MSP430FR5857 , MSP430FR5858 , MSP430FR5859 , MSP430FR5867 , MSP430FR58671 , MSP430FR5868 , MSP430FR5869 , MSP430FR5870 , MSP430FR5872 , MSP430FR58721 , MSP430FR5887 , MSP430FR5888 , MSP430FR5889 , MSP430FR58891 , MSP430FR5922 , MSP430FR59221 , MSP430FR5947 , MSP430FR59471 , MSP430FR5948 , MSP430FR5949 , MSP430FR5957 , MSP430FR5958 , MSP430FR5959 , MSP430FR5962 , MSP430FR5964 , MSP430FR5967 , MSP430FR5968 , MSP430FR5969 , MSP430FR5969-SP , MSP430FR59691 , MSP430FR5970 , MSP430FR5972 , MSP430FR59721 , MSP430FR5986 , MSP430FR5987 , MSP430FR5988 , MSP430FR5989 , MSP430FR5989-EP , MSP430FR59891 , MSP430FR5992 , MSP430FR5994 , MSP430FR59941 , MSP430FR6005 , MSP430FR6007 , MSP430FR6035 , MSP430FR6037 , MSP430FR60371 , MSP430FR6041 , MSP430FR6043 , MSP430FR60431 , MSP430FR6045 , MSP430FR6047 , MSP430FR60471 , MSP430FR6820 , MSP430FR6822 , MSP430FR68221 , MSP430FR6870 , MSP430FR6872 , MSP430FR68721 , MSP430FR6877 , MSP430FR6879 , MSP430FR68791 , MSP430FR6887 , MSP430FR6888 , MSP430FR6889 , MSP430FR68891 , MSP430FR6920 , MSP430FR6922 , MSP430FR69221 , MSP430FR6927 , MSP430FR69271 , MSP430FR6928 , MSP430FR6970 , MSP430FR6972 , MSP430FR69721 , MSP430FR6977 , MSP430FR6979 , MSP430FR69791 , MSP430FR6987 , MSP430FR6988 , MSP430FR6989 , MSP430FR69891
4.6.3.26 RRAX
| RRAX.A | Rotate right arithmetically the 20-bit operand | ||
| RRAX.[W] | Rotate right arithmetically the 16-bit operand | ||
| RRAX.B | Rotate right arithmetically the 8-bit operand | ||
| Syntax | RRAX.A Rdst | ||
| RRAX.W Rdst | |||
| RRAX Rdst | |||
| RRAX.B Rdst | |||
| RRAX.A dst | |||
| RRAX dst or RRAX.W dst | |||
| RRAX.B dst | |||
| Operation | MSB → MSB → MSB–1 ... LSB+1 → LSB → C | ||
| Description | Register mode for the destination: the destination operand is shifted right by 1 bit position as shown in Figure 4-48. The MSB retains its value (sign). The word instruction RRAX.W clears the bits Rdst.19:16, the byte instruction RRAX.B clears the bits Rdst.19:8. The MSB retains its value (sign), the LSB is shifted into the carry bit. RRAX here operates equal to a signed division by 2. | ||
| All other modes for the destination: the destination operand is shifted right arithmetically by 1 bit position as shown in Figure 4-49. The MSB retains its value (sign), the LSB is shifted into the carry bit. RRAX here operates equal to a signed division by 2. All addressing modes, with the exception of the immediate mode, are possible in the full memory. | |||
| Status Bits | N: | Set if result is negative, reset if positive | |
| .A: dst.19 = 1, reset if dst.19 = 0 | |||
| .W: dst.15 = 1, reset if dst.15 = 0 | |||
| .B: dst.7 = 1, reset if dst.7 = 0 | |||
| Z: | Set if result is zero, reset otherwise | ||
| C: | Loaded from the LSB | ||
| V: | Reset | ||
| Mode Bits | OSCOFF, CPUOFF, and GIE are not affected. | ||
| Example | The signed 20-bit number in R5 is shifted arithmetically right 4 positions. | ||
RPT #4
RRAX.A R5 ; R5/16 -> R5
| Example | The signed 8-bit value in EDE is multiplied by 0.5. | ||
RRAX.B &EDE ; EDE/2 -> EDE
Figure 4-48 Rotate Right Arithmetically RRAX(.B,.A) – Register Mode 
Figure 4-49 Rotate Right Arithmetically RRAX(.B,.A) – Non-Register Mode