NicatioNs, hardware> (SPI) A serial iNterface iN which a master device supplies clock pulses to exchaNges data serially with a slave over two data wires (Master-Slave aNd Slave-Master). This term probably origiNated with Motorola iN about 1979 with their first all-iN-oNe microcoNtroller. (2003-07-13)