Character display device for synchronizing operation of video ra

Details Character display device for synchronizing operation of video ra Character display device for synchronizing operation of video ra

1993-04-16

1994-08-16

Groody, James J.

Television

Image signal processing circuitry specific to television

345190, 345200, 395164, 348473, 348476, 348500, H04N 5445, H04N 708

Patent

active

053391608

ABSTRACT:
Specific clock periods in each machine cycle MC used by a CPU are used for accessing a video RAM synchronized with the operation of the operation of the CPU and the remaining clock periods of the machine cycle MC are used for accessing the video RAM synchronized with horizontal scanning and vertical scanning of television signal. Therefore, accessing synchronized with television signals is also performed in response to clock periods of a machine cycle MC and the video RAM can be made of a single port.

REFERENCES:
patent: 4581611 (1986-04-01), Yang et al.
patent: 4646077 (1987-02-01), Culley
patent: 4658294 (1987-04-01), Park
patent: 4748504 (1988-05-01), Ikeda et al.

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