Patent ID: 6933915
Filing Date: 2005-08-23
Classification: G09G

Abstract:
1. A semiconductor device for driving liquid crystals comprising: a single-port memory that stores display-data to be displayed on a liquid crystal displaying section; a liquid crystal driver that retrieves the display-data stored in the single-port memory on a specific cycle and sends the display-data to the liquid crystal displaying section; and a controller that controls the liquid crystal driver so that, when a CPU does not have access to the single-port memory, the display-data is retrieved from the single-port memory to the liquid crystal driver on the specific cycle and the retrieved data is sent to the liquid crystal displaying section, whereas, when the CPU has access to the single-port memory while the data is being retrieved from the single-port memory to the liquid crystal driver, a priority is given to the CPU so that the CPU starts an access operation while the liquid crystal driver stops a display-data retrieval operation, and on completion of the access operation, the liquid crystal driver starts again the display-data retrieval operation, wherein the liquid crystal driver includes: and wherein the controller outputs the first latch signal based on the second latch signal and a CPU-access signal that indicates the access operation of the CPU to the single-port memory.