Oscillating circuitry built in integrated circuitry

Details Oscillating circuitry built in integrated circuitry Oscillating circuitry built in integrated circuitry

1998-02-17

1999-07-27

Mis, David

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

331173, 331175, 327298, H03B 500

Patent

active

059297131

ABSTRACT:
Oscillating circuitry built in integrated circuitry (1) comprises a ring oscillator (31) for generating a first clock, an external oscillator (40) capable of generating a second clock in either one of two oscillating modes which is determined according to an external circuit (12 and 13, or 6 through 8) connected to terminals (2 and 3) thereof, and an internal clock selection circuit (41) which delivers the first clock as an internal clock to the integrated circuitry (1) just after the integrated circuitry (1) is activated or reset, stops the delivery of the first clock and simultaneously furnishes a signal held at a logic high level as the internal clock in response to a control signal for instructing a selection of the second clock, and then determines whether or not the external oscillator (40) is generating the second clock properly, and which furnishes the second clock as the internal clock when it determines that the external oscillator (40) is generating the second clock properly.

REFERENCES:
patent: 5754081 (1998-05-01), Kuroiwa et al.
"8-Bit CMOS EPROM Microcontroller with A/D Converter," Microchip Technology Incorporated Data Book 1993, cover page, pp. 23-27.

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