Microcontroller having a digital to frequency converter...

Details Microcontroller having a digital to frequency converter... Microcontroller having a digital to frequency converter...

2004-12-01

2008-12-16

Tse, Young T. (Department: 2611)

Pulse or digital communications

Pulse position, frequency, or spacing modulation

C375S364000, C370S520000

Reexamination Certificate

active

07466753

ABSTRACT:
A microcontroller having digital to frequency converter and pulse frequency modulator capabilities. The digital to frequency converter (DFC) generates a 50 percent duty cycle square wave signal that may be varied in frequency, wherein the 50 percent duty cycle square wave signal is directly proportional and linear with a count value put into an increment register. The pulse to frequency modulator (PFM) generates pulses having pulse widths of the input clock for each rollover of a counter. The frequency of these pulses is directly proportional and linear with the count value put into the increment register.

REFERENCES:
patent: 4154985 (1979-05-01), Munter
patent: 4374437 (1983-02-01), Citta et al.
patent: 5034962 (1991-07-01), Yamamoto et al.
patent: 5760617 (1998-06-01), Coln et al.
patent: 5930294 (1999-07-01), Chapman
patent: 2003/0173945 (2003-09-01), Grushin
patent: 2551685 (1975-11-01), None
patent: 0068535 (1982-06-01), None
International Search Report and Written Opinion; PCT/US2005/041684; pp. 10.

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