Motorola DSP56000, 24-Bit Digital Signal Processor manual After Execution $00123456000000

INSTRUCTION DESCRIPTIONS

Y: Y Memory Data Move Y:

Note: This parallel data move is considered to be a move-type instruction. Due to instruction pipelining, if an AGU register (Mn, Nn, or Rn) is directly changed with this instruction, the new contents may not be available for use until the second following instruction. See the restrictions discussed in A.9.6 - R, N, and M Register Restrictions on page A-page 310.

Example:

:

EOR X0,B #$123456,A ;exclusive OR X0 and B, update A accumulator

:

A

Before Execution

$FF:FFFFFF:FFFFFF

A

After Execution

$00:123456:000000

Explanation of Example: Prior to execution, the 56-bit A accumulator contains the value $FF:FFFFFF:FFFFFF. The execution of the parallel move portion of the instruc- tion, #$123456,A, moves the 24-bit immediate value $123456 into the 24-bit A1 register, then sign extends that value into the A2 portion of the accumulator, and zeros the lower 24-bit A0 portion of the accumulator.

Condition Codes:

15	14	13	12	11		10	9		8	7	6	5	4	3		2	1		0
LF	DM	T	**		S1	S0		I1	I0	S	L	E	U		N	Z		V	C
				MR										CCR

S — Computed according to the definition in A.5 CONDITION CODE COMPUTATION L — Set if data limiting has occurred during parallel move.

MOTOROLA INSTRUCTION SET DETAILS A - 187