Serial Peripheral Interface

from The Free On-line Dictionary of Computing (8 July 2008)

Serial Peripheral Interface

   <communications, 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)