Motorola DSP56000, 24-Bit Digital Signal Processor manual Restrictions, Example

INSTRUCTION DESCRIPTIONS

STOP

Stop Instruction Processing

STOP

Restrictions:

A STOP instruction cannot be used in a fast interrupt routine.

A STOP instruction cannot be the last instruction in a DO loop (i.e., at LA).

A STOP instruction cannot be repeated using the REP instruction.

Example:

:
STOP	;enter low-power standby mode
:

Explanation of Example: The STOP instruction suspends all processor activity until the processor is reset or interrupted as previously described. The STOP instruction puts the processor in a low-power standby state.

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

The condition codes are not affected by this instruction.

Instruction Format:

STOP

Opcode:

	23							16	15							8	7							0
0		0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	1	1	1

Instruction Fields:

None

Timing: The STOP instruction disables the internal clock oscillator and internal distribu- tion of the external clock.

Memory: 1 program word

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