The RSTACT state will be cleared back to default upon either:
- Detection of a Slave Reset Pattern. This will enact the RSTACT action, and then clear the state.
- Detection of a completed START (but not repeated START). This consists of the SDA line going from High to Low while the SCL line remains High, followed by the first falling edge on SCL. The RSTACT may be cleared either on that falling edge, or on the rising edge that follows.