|Registers / WKT Register description|
The WKT interrupt must be enabled in the NVIC to wake up the part using the self wake-up counter.
|0||CLKSEL||Select the self wake-up timer clock source.||0|
|0||Divided IRC clock. This clock runs at 750 kHz and provides
time-out periods of up to approximately 95 minutes in 1.33 μs increments.
Note: This clock is not available in not available in Deep-sleep, power-down, deep power-down modes. Do not select this option if the timer is to be used to wake up from one of these modes.
|1||Low power clock. This is the (nominally) 10 kHz clock and
provides time-out periods of up to approximately 119 hours in 100
μs increments. The accuracy of this clock is limited to +/- 40 %
over temperature and processing.
Note: This clock is available in all power modes. Prior to use, the low-power oscillator must be enabled. The oscillator must also be set to remain active in Deep power-down if needed.
|1||ALARMFLAG||Wake-up or alarm timer flag.||-|
|0||No time-out. The self wake-up timer has not timed out. Writing a 0 to has no effect.|
|1||Time-out. The self wake-up timer has timed out. This flag generates an interrupt request which can wake up the part from any reduced power mode including Deep power-down if the clock source is the low power oscillator. Writing a 1 clears this status bit.|
|2||CLEARCTR||Clears the self wake-up timer.||0|
|0||No effect. Reading this bit always returns 0.|
|1||Clear the counter. Counting is halted until a new count value is loaded.|
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