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Can the ATTINYx5 use its universal serial interface for a better UART than the Sofware Serial library alone? If so, is there a library or tutorial for this?

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AVR307 describes implementation of a half duplex UART implementation using the USI. Note that full duplex is not possible due to the synchronous design of the USI.

  • That implementation uses ISR(TIMER0_OVF) to clock bits in and out. This is not needed on the ATtinyX5, since you will clock the USI from TIM0_COMPA and set timer0 to CTC mode instead of periodically reloading the seed. – Edgar Bonet Feb 4 '16 at 16:53

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