Data transfer control device

Claim 1

A data transfer control device having an input terminal for receiving constant-formatted data and an output terminal for connection to a display having common electrodes, said data transfer control device comprising: a plurality of shift registers for storing data and providing output signals to said output terminal; means for receiving a common electrode selecting signal; selector means, coupled to said input terminal and said common electrode selecting signal means, for receiving said constant-formatted data at said input terminal, for changing the arrangement of said constant-formatted data in accordance with said common electrode selecting signal, said selector means comprising a plurality of outputs for outputting said data with changed arrangements to a plurality of multiplexers; and; means for receiving a mode selection signal; wherein each one of said plurality of multiplexers is coupled to said mode selection signal receiving means and to a different one of said selector means outputs, and is further coupled to an input of a different one of said plurality of shift registers, said plurality of multiplexers including means, responsive to said mode selection signals, for either supplying said constant-formatted display data from said selector means to said shift registers or shifting the stored data in said shift registers in a closed loop.