Quote Originally Posted by skimask View Post
Do you use OSCTUNE as applicable and tweak it as required or have they just plain ol' been good enough in your experience?
I've never found the need to tweak it beyond the factory calibration. I programmed the 12F629 as an enhanced replacement for the 12C508A in the MR26. I've never had a complaint from hundreds of users. I'm sure there are many thousands using the original and I've never seen any complaints about it either.

My use of the data line for Vcc is with the NEC protocol where the shortest pulse/space is 500µS. (I've given examples in the Code Examples forum). Faster protocols might have problems but I have seen none.