CHAPTER 6: Low Power Consumption Mode
206 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
Return from Sleep Mode
The CPU returns from Sleep mode in one of the following situations.
Return due to reset
If a reset (INITX pin input reset, low voltage detection reset, software watchdog reset, hardware watchdog
reset, clock supervisor reset or anomalous frequency detection reset) occurs, the CPU switches to high
speed CR run mode regardless of the clock mode.
Return due to interrupt
On receiving an effective interrupt from a peripheral in Sleep mode, the CPU returns from Sleep mode
and transits to a Run mode corresponding to the clock mode indicated in the RCM[2:0] bits in the System
Clock Mode Status Register (SCM_STR).
Table 3-5 Operation Mode after Return from Sleep Mode due to Interrupt
RCM: RCM[2:0] bits in System Clock Mode Status Register (SCM_STR)
*: For details of the SCM_CTL and SCM_STR registers, see Chapter Clock.
Oscillation stabilization wait at return
On returning from Sleep mode due to a reset, the CPU waits for the stabilization of high speed CR clock
oscillation and that of low speed CR clock oscillation. In the case of returning from Sleep mode due to an
interrupt, the CPU does not have to wait for the oscillation to stabilize.
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