5.5 RTCOUTx Pins

RTCOUT0 can be used to generate waveforms from the RTC in order to take advantage of its inherent prescalers while the RTC is the only powered circuitry (Low-Power mode, Backup mode) or in any active mode. Entering Backup or Low-Power operating modes does not affect the waveform generation outputs; the RTCOUT0 pad is referenced to the output of the power switch.

RTCOUT1 is shared in the PIO multiplexing and is referenced to VDD3V3. RTCOUT1 has the same function as RTCOUT0 but cannot be used as a sampling signal for tamper pins.

Anti-tampering pin detection can be synchronized with RTCOUT0 only.