u/Electrical_Base_6416

I’m learning the 1-Wire protocol with a DS18B20 and I’m confused about one thing in the timing diagram (see attached picture).

From what I understand:

- Writing a 1: the master pulls the data line low for about 6 µs and then releases it
- Read slot: the master also pulls the data line low for about 6 µs and then releases it

So from the slave’s perspective, both situations seem to start exactly the same way.

My question is:

How does the slave know whether:
- the master is sending a bit (write-1)
OR
- the master wants the slave to send a bit back (read slot)?