INSTRUCTION DESCRIPTIONS
MOTOROLA INSTRUCTION SET DETAILS A - 275
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:
The condition codes are not affected by this instruction.
Instruction Format:
STOP
Opcode:
Instruction Fields:
None
Timing: The STOP instruction disables the internal clock oscillator and internal distribu-
tion of the external clock.
Memory: 1 program word
MR CCR
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
STOP Stop Instruction Processing STOP
23 16 15 8 7 0
000000000000000010000111