Electronic equipment having display device in which a shared mem

Details Electronic equipment having display device in which a shared mem Electronic equipment having display device in which a shared mem

1995-02-22

1997-09-09

Peng, John K.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345185, 345200, 345 27, G09G 500

Patent

active

056661355

ABSTRACT:
A piece of electronic equipment having a display device, the display control is allowed to read out the display data stored in the data storing means when detecting that the central processing unit (CPU) sets the data bus to a high-impedance state. Therefore, the CPU and the display control are inhibited from accessing the data storage at the same time, so that there is no case where erroneous data are read out from or written into or the display is disturbed. Accordingly, the operation data and the display data can be stored into a one-chip data storage. Further, since the data bus is periodically set to the high-impedance by the CPU, the CPU can accurately count a predetermined time with the soft timer program.

REFERENCES:
patent: 4660156 (1987-04-01), Guttag et al.
patent: 4942391 (1990-07-01), Kikuta
patent: 5245323 (1993-09-01), Ichijo
patent: 5542110 (1996-07-01), Minagawa

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