I am using an atmega32 with the internal oscillator set @ 4mhz. Everything works fine so far: usart @ 9600 baud, bootloader (I think it runs @ 19200), and all other functions I am using. I am using an external 32khz clock xtal for timing functions.
My question: If everything is working fine, is there a reason I should use an external crystal? What kind of trouble has anybody run into usnig the internal osc that I should look out for? Will the micro be less or more ESD sensitive? Is the internal osc unreliable? Will it quit altogether if the ambient temp is below 0c?
Any thoughts and experiences are appreciated. --Karl