System and method for generating variable-length timing signals in an electronic imaging device
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United States of America Patent
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Dec 24, 2002
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app pub date -
Nov 4, 1997
filing date -
Nov 4, 1997
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Abstract
The present invention includes a system and method for generating variable-length timing signals in an electronic imaging device. A digital camera device includes an electronic image sensor which requires a complex set of timing signals to effectively capture image data. The digital camera therefore also includes timing generation circuitry which generates a set of precise timing signals for a variable-length frame time necessary to control and synchronize the electronic image sensor within the digital camera. The present invention includes a transfer substrate charge (Xsub) source circuit and a frame time source circuit, each containing a downcounter. The point in time when the downcounters reach zero is available as a precise and programmable timing reference. Both the Xsub time and frame time source circuits are loaded from registers under software control.
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