Datasheet

Instruction Set Description www.ti.com
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
RRAX.A Rdst
Syntax
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 one bit
position as shown in Figure 4-47. 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 one bit position as shown in Figure 4-48. 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 four positions.
RPT #4
RRAX.A R5 ; R5/16 -> R5
242
CPUX SLAU144J–December 2004–Revised July 2013
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