Hi,
Iam looking at using a 16F88 with an AD7730 and outputing the result in RS-232. I have read in other threads that the internal oscillator is not recommended for asynchronous serial. I have a few questions and would be very greatful if someone could help me with any of them.

1. Is the problem that the ocsillator is unstable or can it be adjusted with the OSCTUNE register to work ok?

2. It says on page1 of the datasheet that you don't need a crystal for RS-232. Is this not true?

3. As the 16F88 only has 1 AUSART port is it better to use it for RS-232 or SSP.

Thanks,

Mike