Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2008-01-22
2008-01-22
Bayard, Emmanuel (Department: 2611)
Pulse or digital communications
Transceivers
Modems
C375S222000, C375S225000
Reexamination Certificate
active
07321615
ABSTRACT:
An UART receives asynchronous transmission serial data based on a baud-rate clock from a DTE. An MPU analyzes the data received by the UART. A baud-rate generating portion generates the baud-rate clock to be output to the UART in accordance with instructions from the MPU. A first counter measures the span of the start bit of the first character of an AT command transmitted from the DTE based on instructions from the MPU. A decoder receives a measurement result of the first counter, outputs frequency-dividing data for producing a clock for sampling the first character, and also outputs, when the rate of the start bit is more than a preset value, a flag indicating this matter. A second counter selects, in accordance with whether or not the flag is has been set, the frequency-dividing data from either the decoder or the MPU, and produces the sampling clock. A shift register receives data subsequent to the start bit of the first character based on the sampling clock from the second register, holds the received data, which data is then read by the MPU.
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Ishizaka Yasuhiro
Kinoshita Izumi
Ryu Tadanori
Bayard Emmanuel
Dickstein & Shapiro LLP
Ricoh & Company, Ltd.
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