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And one more thing - I have developed an MCU (attiny) based module for cars
which communicated with a main board over a 9600bps RS232 (TTL levels).
I had used the internal RC oscillator to clock the MCUs and it resulted in a failure - when the temperatures outside dropped below around 0 degrees C, I was unable to communicate with some of the modules, because the RC clock
drifted too much and the main unit could not understand RS232 frames
anymore.
I had to come up with a second revision of the module with a crystal clock.
Your design seems to use an internal oscillator - do you have any precaution worked out for this issue?
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