Monitor-mode control circuit and method thereof

Details Monitor-mode control circuit and method thereof Monitor-mode control circuit and method thereof

1996-04-29

1998-01-27

Swann, Tod R.

Pulse or digital communications

Repeaters

Testing

375238, 345213, 345214, 345132, 345133, 345134, 348469, 348536, 348554, G09G 500

Patent

active

057130400

ABSTRACT:
A monitor-mode control circuit and method thereof determines a video mode by detecting horizontal and vertical sync frequencies and the polarities of the sync frequencies received from a video card, varies an external resistance value connected to a predetermined port of a microprocessor in accordance with the determined video mode to output a voltage for controlling the picture status of the monitor, in which a program of the microprocessor is changed by a demand of a buyer without changing the hardware to easily correspond to any specification required by the buyer unrestricted by the specification, an external resistance value connected to the predetermined port of the microprocessor at a high or low state is varied to adjust and output voltages of a horizontal size, a vertical size, a horizontal position, a vertical position and a side pin/barrel corresponding to the determined video mode, and a voltage of an oscillating frequency for correcting the synchronization of a picture is output by a pulse width modulation method, so that manufacturing cost is reduced without using a D/A converter of an EEPROM to heighten the competitive power of the products.

REFERENCES:
patent: 4168508 (1979-09-01), Gilbert
patent: 4306270 (1981-12-01), Miller et al.
patent: 4727362 (1988-02-01), Rackley et al.
patent: 5027212 (1991-06-01), Marlton et al.
patent: 5161022 (1992-11-01), Ichimura et al.
patent: 5237223 (1993-08-01), Song
patent: 5285197 (1994-02-01), Schmidt et al.
patent: 5367266 (1994-11-01), Kang
patent: 5384642 (1995-01-01), Sim
patent: 5394171 (1995-02-01), Rabii
patent: 5473666 (1995-12-01), Szczebak, Jr. et al.
patent: 5493317 (1996-02-01), Kim
Motorola Inc "MC68HC705H2 HCMOS Microcontroller Unit", 1992, Oct. 1 to Oct. 8.
Perkins et al., "Multimode High . . . Chip Set," IEEE, 1990, pp. 458-466.

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