I am running a 328 using the internal oscillator at 8 Mhz dividing down to 1 Mhz as I am using a 3.3v power source. However the system hangs after a while (I have a 'hearbeat' LED connected, which stops flashing). I know that to use serial (UART) communications with this setup, I have to use a slow…

SPI_CLOCK_DIV and internal oscillator

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