Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – Having selection between plural continuous waveforms
Patent
1997-07-25
2000-07-04
Wambach, Margaret R.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
Having selection between plural continuous waveforms
327115, 327117, 327292, 327294, 327298, 377 20, 377 47, H03K 104
Patent
active
060844418
ABSTRACT:
A data processing apparatus functions as a timer or counter by counting clock pulses of a system clock signal to generate a timing signal. The system clock signal is generated as one of either a first or a second basic clock signal generated by two respective oscillators. Even if the second basic clock signal which has a lower frequency fluctuates, the data processing apparatus can accurately generate a pulse signal having a desired period. When the first basic clock signal is selected as the system clock signal, the second basic clock signal is measured with the system clock signal. When the second basic clock signal is selected as the system clock signal, a numerical value up to which the clock pulses of the system clock signal are counted is corrected on the basis of the measured second basic clock signal.
REFERENCES:
patent: 4023109 (1977-05-01), Shreve
patent: 5027298 (1991-06-01), Khazam
NEC Corporation
Wambach Margaret R.
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