I have been 'experimenting' with XMEGA and SAMD21 chips off and on recently in anticipation for some possible future projects coming up. The learning curve is pretty steep, but I am plucking away at it with pretty good success.
Heres the rub....I have been looking at the clocks for both chips and they share a lot of similarities. Being COMPLICATED in my opinion is one of them, but more importantly their accuracy over temperature/voltage. The voltage is not so important to me as the supplies are well regulated 3v3, but the temperature is another thing as these devices are going to be in very wide temperature environments.
I was wondering if anyone is using JUST the internal oscillator for their designs with USART comms, or do you stick with the tried, and proven Crystal oscillator?
I m not concerned about the cost of a $0.10 crystal. I am more interested in user experience/feedback.