How do I change the Triggering method for the 1PPS signal?
The AVR triggers by default (when in a clean state) on the falling edge of the 1PPS signal because the RTC, which is the default 1PPS signal generator, produces a negative going signal. An external 1PPS signal may require a trigger on the rising edge of the signal, for example if it is a long positive going signal or the return to GND level is very slow. You can toggle the 1PPS trigger mode using the ‘M’ command. The AVR Clock will reboot after this command since the INT0 interrupt needs to be reinitialized.
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