Circuit which supplies a clock pulse to a microcomputer

Details Circuit which supplies a clock pulse to a microcomputer Circuit which supplies a clock pulse to a microcomputer

1996-11-14

1997-09-30

Butler, Dennis M.

Oscillators

Relaxation oscillators

331 74, 331158, G06F 104

Patent

active

056734247

ABSTRACT:
A circuit which supplies a clock pulse to activate the microcomputer includes a sinusoidal wave oscillation circuit. A sinusoidal waveulse converting circuit is provided which converts an oscillation output of the sinusoidal wave oscillation circuit into a clock pulse when the level of the oscillation output exceeds a predetermined value. The clock pulse is supplied to the microcomputer by the converting circuit. The converting circuit includes a first inverter having a threshold value on the high voltage side of the central level of the amplitude of the oscillation output and a second inverter having a threshold value on the low voltage side of the central level of the amplitude. In addition, the converting circuit includes an RS flip flop which generates a clock pulse whose level changes alternately by the outputs of the first and second inverters.

REFERENCES:
patent: 4864255 (1989-09-01), Yoshida
patent: 5184032 (1993-02-01), Leach
patent: 5369311 (1994-11-01), Wang et al.
patent: 5454114 (1995-09-01), Yach et al.
patent: 5511126 (1996-04-01), Westwick
Sergio Franco, "Design With Operational Amplifiers and Integrated Circuits", McGraw-Hill, 1988, pp. 313-323, 354-359 and 369-371.
Joseph Greenfield, "Practical Digital Design Using Ics", John Wiley and Sons, 1977, pp. 126-130.
Texas Instruments, "The TTL Data Book Volume 2", 1985, pp. 3-75 to 3-93.

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