Pulse width modulation control which data transfer is inhibited by overflow signal
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United States of America Patent
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Feb 8, 2000
Grant Date -
N/A
app pub date -
Feb 4, 1998
filing date -
Mar 25, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
In a pulse width modulation (PWM) control circuit, a free run counter counts a pulse signal to count a value, and generates an overflow signal when the counted value is equal to a predetermined value. A transfer control circuit allows a set value to be transferred from a master compare register to a slave compare register and inhibits the transfer of the set value in response to the overflow signal. A comparing circuit compares the counted value in the free run counter and the set value transferred into the slave compare register and generates a coincident signal when the counted value is coincident with the set value. An output circuit generates a PWM signal in response to the overflow signal and the coincident signal.
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