Quote Originally Posted by tenaja View Post
rdxbam, you have heard correctly. "Some" of the time, the intosc will work (which is fine for hobbyists), but you cannot count on it--especially at higher speeds. M'chips spec is that they calibrate it within 1%, but my experience is to the contrary--I use enough of them to know they are regularly 3% or more out of spec, and I have seen them as bad as 6% off.
Normally I would agree, but MicroChip seems to have done something different with this chip.
From the F88 data sheet.
Addressable Universal Synchronous
Asynchronous Receiver Transmitter
(AUSART/SCI) with 9-bit address detection:
- RS-232 operation using internal oscillator
(no external crystal required)
Like I said before, seems like they are correct. No mention of 1% +-.

Oh, and why do you think the hobby project does not have to work all of the time?