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the basic concept is buck converter design,norally if PV voltage reaches above 14v there should be control to maintain the voltage to 14v from PV, so you have to reduce the duty cycle, you select the MC with PWM channel get ADC feedback and adjust the duty cycle according to ADC voltage
if you set fuse bits you need to connect external crystel, but you have to specify same crystel freq in program
hi!
as per my knowledge, if you set fuse bits in AVR you no need to connect external crystel. but you have to specify crystel frq in program.