![]() ![]() ![]() ![]() The Arduino core for ATtiny includes a Software Serial library which implements a serial UART interface. This post describes how to implement a simple UART receiver using the USI module. The USI module can be used to implement SPI, TWI (also known as I 2C) and UART serial interfaces. Many ATtiny microprocessors don’t include a hardware UART, but do include a Universal Serial Interface, USI.
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