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 Display data write control device

Details
Inventors: Ishikawa, Ryo;
Assignee: Casio Computer Co., Ltd. (Tokyo, JP)
Primary Examiner: Brier; Jeffery
Assistant Examiner:
Attorney, Agent or Firm: Frishauf, Holtz, Goodman, Langer & Chick

A system memory in the electronic device has a display data memory area, and when a CPU accesses directly to the system memory, the liquid crystal display control section (LCDC) monitors whether or not address data is directed to the display data memory area. In the case where the address data associated with display data is directed to the display memory area, the LCDC also sends the display data and the address data to the display driving circuit. The display driving circuit comprises a VRAM, in which the display data is stored in a predetermined memory location in accordance with the received address data, and the stored data is displayed on the LCD.

DETAILED DESCRIPTION The present invention has been proposed in consideration of the above problems, and the object thereof is to provide a display control device in which the software designing burden in order for storing display data output from the CPU into the display memory, can be reduced.
According to the present invention, there is provided an electronic device comprising: a dot matrix type display screen; a display driving circuit for driving the display screen; a process unit for controlling operation of the electronic device; a system memory having a memory area directly address-controllable by the process unit and containing a display memory area; and a display data write control circuit, included in the process unit, for detecting display data written from the process unit to the display memory area of the system memory, and transferring the display data to the display driving circuit.
Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the appended claims.



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