Quote Originally Posted by Melanie
There is no significant difference between a 628 and a 628A.However, any form of timing critical functions (such as SEROUT, SERIN etc) on INTERNAL OSCILLATOR is suspect. Just because it worked on a 628 (non-A) means you were lucky. I used to say, never go above 300 Baud on Internal Oscillator, but I've had batches of chips where even that wasn't reliable.
Melanie

I do not quite understand your statements. I use the 628A on a regular basis with 9600 baud for SERIN2 and SEROUT2 with no problems till now. Can you please clarify if this is something to watch out for as a gotcha ??

Jerson