Patent ID: 7058133

Claim:
A method of digital communicating via a three-wire link among a first unit having at least one serial data input and a write select command output; at least two second units, each having a serial data output and a write select command input; a one-wire serial data communication line interconnecting second unit serial data outputs and said serial data input; a one-wire write select command line interconnecting said write select command output and said second unit write select command inputs; a clock wire line interconnecting said first and said at least two second units; comprising the steps of: establishing communication from said second units to said first unit by generating from said write select command output a write select command signal to said write select command inputs, thereby establishing which of said second units is allowed to write data on said serial data communication line; establishing communication from said first unit to said second units by encoding at said first unit upon said write select command signal on said write select command line further data, and decoding said further data from said write select command line at said second units.