Serial data bus for sci, spi and buffered spi modes of operation

Abstract From the Canadian patent

The aim of the Chrysler Collision Detector (CCD) Bus System is to allow multiple microprocessors to easily communicate with each other over a common pair of wires (called a bus) using a scheme similar to a telephone party line. All microprocessors connected to the bus are able to receive all messages transmitted on the bus. Any microprocessor with a message to transmit on the bus waits untilany current user is finished before attempting to use it. Whenever the bus is available, its use is allocated on a first-come first-serve basis (i.e. whichever, microprocessor first begins transmitting its message on the bus after any previous message finishes gets the use of the bus). If however, …