IBM PowerPC 604 User Manual page 189

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Nap mode is exited (clocks resume and MSR[POW] cleared) when an external interrupt is
signaled by the assertion of INT, SRESET, MCP, or SMI, when a decrementer interrupt
occurs, or when a hard reset is sensed.
For more information about the RUN and HALTED signals, refer to Section 7 .2.10.4, "Run
(RUN)-lnput," and Section 7 .2.10.2, "Reservation (RSRV)-Output."
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PowerPC 604 RISC Microprocessor User's Manual