W1: Timing

Communication happens through low pulses:
A long pulse is write-0 (it reads as 0 after a delay): 60 - 120 us
A short pulse is write-1 (it reads as 1 after a delay): 1 - 15 us
A short pulse can also be used to read a bit
The slave will make the pulse longer, or not.

An initial long pulse is used to reset the bus (480us or more)