I3C Support from CCS?

djsb · Joined: 29 Jan 2011 Posts: 51

The PIC18F16Q20 supports I3C. I wonder if anyone is using this chip and if so are they using I3C. Does CCS support I3C yet? It seems to use only 2 wires and combines I2C and SPI. I've just started reading about it in the August 2025 edition of Practical Electronics magazine (a UK electronics magazine). Any info yet? Thanks.

Ttelmah · Joined: 11 Mar 2010 Posts: 19892

You are missing the key point on this. The device only implements an I3C
'target' device, _not_ a master. It can't control an I3C bus, it is a 'slave'
device on the bus.
It can only be used with another device providing the master. So you are not
going to get any utility or speed from this till you have the master device....
So, what do you intend to use as the master device??????.

It isn't going to be any use, until they launch some master PIC's for this
I'm afraid. Sad

It is also limited in the modes it can support. As a peripheral, it is designed
to allow you to implement the PIC as a peripheral on this bus, not anything
more.

djsb · Joined: 29 Jan 2011 Posts: 51

Ttelmah,
Thanks for clarifying that. Saves me making a fool of myself by getting over enthusiastic again. I'll still keep my eye on this just in case.

David.

Ttelmah · Joined: 11 Mar 2010 Posts: 19892

Yes. The great thing is that when we have some PIC's implementing the
master part, these hopefully will have the improved drivers this needs,
and allow I2C at much faster rates. It is still I2C 'like', but implements
high speed drivers, error correction, and a proper protocol for dynamic
addressing. Should be a very nice way to signal once we have both ends!....
Very Happy

Ttelmah · Joined: 11 Mar 2010 Posts: 19892

As a comment, CCS have implemented DMA support and interrupt support
for the I2£ receive peripheral, but I can't see any setup function for it.