![]() 1000000 for 1MHz), this core clock can be changed easily. ![]() This "board" is configured to use 8MHz as core clock, so that the ATmega328p runs at the highest frequency possible without external clock sources.īy setting the environment variable ATMEGA328P_CLOCK to a custom frequency in Hz (e.g. It will not be needed anymore after the clock device has been disabled.) ![]() The -B 32 might be needed on some ISP programmers to communicate with slow ATmega MCUs. (Replace usbtiny with the ISP programmer you are using. This can be done like this: avrdude -c usbtiny -p m328p -B 32 -U lfuse:w:0xe2:m By clearing the CKDIV8 fuse the clock divider can be disabled to operate the ATmega328p at 8MHz without an external clock source. By default the fuses are configured to use the internal 8MHz oscillator and a clock divider resulting in a clock speed of 1MHz. The ATmega328p has two internal oscillators clocked at 8MHz and at 128kHz that allow it to be operated without any external clock source or crystal. All credit for above pinout image goes to ![]()
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