Motorola 24-Bit Digital Signal Processor, DSP56000 Clear Accumulator, Always cleared Always set

INSTRUCTION DESCRIPTIONS

	CLR	Clear Accumulator	CLR
Operation:		Assembler Syntax:
	0 ➞D (parallel move)	CLR D (parallel move)

Description: Clear the destination accumulator. This is a 56-bit clear instruction.

Example:

:

CLR A #$7F,N;clear A, set up N0 addr. reg.

:

A

Before Execution

$12:345678:9ABCDE

A

After Execution

$00:000000:000000

Explanation of Example: Prior to execution, the 56-bit A accumulator contains the value $12:345678:9ABCDE. The execution of the CLR A instruction clears the 56-bit A accumulator to zero.

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

E — Always cleared

U — Always set

N — Always cleared

Z— Always set

V — Always cleared

A - 70 INSTRUCTION SET DETAILS MOTOROLA