http://www.engineersgarage.co | Microcontroller › 8051 › Bit Banging For 8051, Spi › http://www.engineersgarage.co February 9, 2011 at 1:31 pm #5485 dagakshayParticipant http://www.engineersgarage.com/embedded/avr-microcontroller-projects/spi-serial-peripheral-interface-tutorial-circuit