I want to build a basic Atmega8a (DIP-28) micro-controller circuit (programed using a 10 pin ISP socket).
I have found several basic circuits. Some of them use crystal oscillator, some use internal oscillator.
1- What options we have when it comes to oscillator? (different methods of using internal and external oscillator).
2- When we use which?
3- What problems each might pose when transferring programs to the chip using an ISB programmer (say USB ASP). Which one is easier to use?