C8051F91X-C8051F90X 查看數據表（PDF） - Silicon Laboratories

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C8051F91X-C8051F90X

Single/Dual Battery, 0.9–3.6 V, 16–8 kB, SmaRTClock, 12/10-Bit ADC MCU

Silicon Laboratories 

C8051F91x-C8051F90x

14.7. Determining the Event that Caused the Last Wakeup

When waking from idle mode, the CPU will vector to the interrupt which caused it to wake up. When wak-

ing from stop mode, the RSTSRC register may be read to determine the cause of the last reset.

Upon exit from suspend or sleep mode, the wake-up flags in the PMU0CF register can be read to deter-

mine the event which caused the device to wake up. After waking up, the wake-up flags will continue to be

updated if any of the wake-up events occur. Wake-up flags are always updated, even if they are not

enabled as wake-up sources.

All wake-up flags enabled as wake-up sources in PMU0CF must be cleared before the device can enter

suspend or sleep mode. After clearing the wake-up flags, each of the enabled wake-up events should be

checked in the individual peripherals to ensure that a wake-up event did not occur while the wake-up flags

were being cleared.

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Rev. 1.0

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