Post by thread:[PIC] PIC16F690 internal oscillator stability.

Hi, I looked at the datasheet and googled before :-) It seems that the internal oscillator on the 16F690 is stable and precise enough for serial communications as long as the other side has a crystal and I maintain VCC at 3.3 volts. Is that assumption correct ? Can I really rely on the internal oscillator for USART communications ? Speed will be 4800 baud. Best regards, Alexandre Guimaraes -- I am using the free version of SPAMfighter for private users. It has removed 3312 spam emails to date. Paying users do not have this message in their emails. Get the free SPAMfighter here: http://www.spamfighter.com/len

> It seems that the internal oscillator on the 16F690 is stable and > precise enough for serial communications as long as the other side > has a > crystal and I maintain VCC at 3.3 volts. Is that assumption > correct ? Can I > really rely on the internal oscillator for USART communications ? > Speed will > be 4800 baud. I use 9600pbs in a project and it appears to work perfectly. My protocol has built in checksumming etc and have rarely seen errors despite the fact its in a reasonably harsh environment.

> Can I really rely on the internal oscillator for USART Probably, except if very cold or very hot (see Table 17.2), which you could test for yourself with a freezer / oven. 3% is reckoned to be about the difference limit