atbetaflight/docs/Rx.md

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Receivers (RX)

Parallel PWM

8 channel support, 1 channel per input pin. On some platforms using parallel input will disable the use of serial ports and softserial making it hard to use telemetry or gps features.

PPM (PPM SUM)

12 channels via a single input pin, not as accurate or jitter free as methods that use serial communications.

MultiWii serial protocol (MSP)

Allows you to use MSP commands as the RC input. Only 8 channel support to maintain compatibility with MSP.

Spektrum

12 channels via serial currently supported.

SUMD

8 channels supported currently, 12 or more is technically possible.

SBUS

12 channels via serial supported currently.