Making SPI master is simple, so if ATtiny is the master then you can easily make SPI transmission/reception on it.
Problem With UART
Hi, I need to connect my aduc842 to attiny using e.g. uart (maybe SPI).
(ADuC master, ATTiny slave)
From what I've found in documentation and internet, ATTiny13a doesn't support neither of them nor has USI.
I don't know how to write software SPI by myself.
Thanks for your time,
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