While the Raspberry Pi has very good support for an I2C bus, a lot of very cool chips – including the in system programmer for just about every ATtiny and ATmega microcontroller – use an SPI bus.

One reason for this triggered sequence approach is that the 1-wire bus main interface has no hope of keeping up with the raw data rate of its slave interface – the 1-wire interface works at 11kbit/s ( ...