Patent ID: 7176870

Claim:
A liquid crystal controller driver on a semiconductor chip, comprising: first data terminals to which moving picture data is to be supplied; a first terminal to which a vertical synchronization signal is to be supplied; a second terminal to which a horizontal synchronization signal is to be supplied; a third terminal to which a dotclock is to be supplied; a fourth terminal to which an enable signal is to be supplied; second data terminals to which still picture data is to be supplied; a clock generation circuit for generating an internal operation clock signal; an external display interface which is coupled to the first data terminals and the first to fourth terminals; a system interface which is coupled to the second data terminals; a memory which stores picture data to be displayed to a display panel to be coupled to the liquid crystal controller driver; a display drive circuit which is coupled to the memory and which provides display data to the display panel in accordance with the picture data read from the memory; a first register designating, at a time when reading the picture data from the memory, one of a first read operation synchronized with the internal operation clock signal, and a second read operation synchronized with the vertical synchronization signal, the horizontal synchronization signal and the dotclock; and a second register designating, at a time when writing the picture data to the memory, one of a first write operation in which the picture data provided to the system interface via the second data terminals is written to the memory, and a second write operation in which the picture data provided to the external display interface via the first data terminals is written to the memory.