OSCILLATION CIRCUIT
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United States of America Patent
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N/A
Issued Date -
Feb 5, 2009
app pub date -
Sep 28, 2006
filing date -
Feb 20, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A first switch (SW1) is connected in series between a first capacitor (1) and a grounding wire, and when an RTC oscillation apparatus is connected and an IC chip (10) is configured as an external input buffer circuit, the first switch (SW1) is turned off. Thus, the first capacitor (1) and a second capacitor (2) are prevented from being connected in parallel to a resonance capacitor of the RTC oscillation apparatus, and the first and the second capacitors (1, 2) are prevented from configuring a part of the resonance circuit of the oscillation apparatus. When an exclusive crystal oscillator is connected and the IC chip (10) is configured as a part of the oscillation apparatus, the first switch (SW1) is turned on and the first and the second capacitors (1, 2) configure a part of the resonance circuit.
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