Clock generating circuit for use in single chip microcomputer

Details Clock generating circuit for use in single chip microcomputer Clock generating circuit for use in single chip microcomputer

1992-05-13

1994-11-01

Callahan, Timothy P.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Pulse multiplication or division

327115, 327116, 327176, 327295, H03K 2100, H03K 3017

Patent

active

053612906

ABSTRACT:
A basic clock signal generating circuit for use in a single chip microcomputer includes a frequency divider receiving an external clock signal for generating a frequency-divided clock signal, and a waveform shaping circuit receiving the frequency-divided clock signal output so as to generate a waveform-shaped frequency-divided clock as a basic clock of single chip microcomputer. An original oscillation clock generation circuit receives the external clock signal and generates an original oscillation clock having a frequency which is a-double of that of the basic clock. The basic clock and the original oscillation clock can be supplied to a peripheral circuit so that either the basic clock or the original oscillation clock can be selectively used in an internal circuit of the peripheral circuit.

REFERENCES:
patent: 4471299 (1984-09-01), Elmis
patent: 4623845 (1986-11-01), Ide
patent: 4968899 (1990-11-01), Katsutani et al.
patent: 4985640 (1991-01-01), Grochowski et al.

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