This pin is Flipper TX on USART (so connect to RX on device).

The Signal Generator/Clock Generator app uses LPTIM1.EXT (pin 13) for the clock signal.

Generic GPIO uses PB6.

CHECK: "COMP2 IN+/MCO"

Devices:
- NMEA GPS[USART] (RX)
- HC-SR04[GPIO] (Trig)