Motorola CPU32 Manuel d'utilisateur Page 539

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Supervisor (Privileged) Instructions
MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 6-85
STOP Load Status Register and Stop STOP
(M68000 Family)
Operation: If Supervisor State
Then Immediate Data SR; STOP
Else TRAP
Assembler
Syntax: STOP # < data >
Attributes: Unsized
Description: Moves the immediate operand into the status register (both user and
supervisor portions), advances the program counter to point to the next instruction, and
stops the fetching and executing of instructions. A trace, interrupt, or reset exception
causes the processor to resume instruction execution. A trace exception occurs if
instruction tracing is enabled (T0 = 1, T1 = 0) when the STOP instruction begins
execution. If an interrupt request is asserted with a priority higher than the priority level
set by the new status register value, an interrupt exception occurs; otherwise, the
interrupt request is ignored. External reset always initiates reset exception processing.
Condition Codes:
Set according to the immediate operand.
Instruction Format:
Instruction Fields:
Immediate field—Specifies the data to be loaded into the status register.
1514131211109876543210
0100111001110010
IMMEDIATE DATA
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