Display control for selecting oscillating signals

Details Display control for selecting oscillating signals Display control for selecting oscillating signals

1992-01-08

1993-07-27

Chin, Tommy

Communications: electrical

Visual indication

Movable

331 49, 331 46, G09G 300

Patent

active

052313891

ABSTRACT:
A display control apparatus includes a display control block with plural external connector terminals, and an oscillator block including plural oscillators. The external connector terminals are coupled to a selector for selecting one of the terminals in response to a selection signal applied thereto, with the output of the selector connected to the internal display control circuit via a second gate. A predetermined one of the terminals is coupled via a first gate to the internal display control circuit. The selection signal is coupled to the external connector terminals other than the predetermined terminal via a third gate. When the oscillator block of one type is used, the apparatus operates in a first operating mode, in which the first and third gates are closed and the second gate is opened, and when the oscillator block is of another type, the apparatus operates in a second mode in which the first and third gates are opened and the second gate is closed.

REFERENCES:
patent: 3594656 (1971-07-01), Tsukamoto
patent: 4419429 (1983-12-01), O'Brien
patent: 4686567 (1987-08-01), Burdick
patent: 4916442 (1990-04-01), Kim
patent: 5089793 (1992-02-01), Nagao

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