I've been using the Tiny26 and 261 for a while now (I actually got an email last week saying that the 261 was being discontinued). One product I'm now working on requires 17 I/Os. I was thinking of using the Tiny40 which has 18 (if you include reset, which I don't). This is enough pins, and it has enough ADCs and timers etc for what I want.
But then I noticed that it has some new (to me anyway) programming method. No longer uses SPI but rather TPI. Is there anything I should know when migrating to this? I see that the ISP mkII is compatible and the connector wiring is basically the same.
Cheers - Matt