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Microcontroller available for remote transmission

  • US 6,617,937 B2
  • Filed: 02/26/2002
  • Issued: 09/09/2003
  • Est. Priority Date: 05/11/2001
  • Status: Expired due to Fees
First Claim
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1. An integrated circuit with infrared transmission function comprising:

  • a frequency prescaler for receiving an oscillation frequency and dividing said oscillation frequency to produce a carrier for infrared transmission;

    a duty cycle selector for receiving said carrier produced by said frequency prescaler and adjusting a duty depending on a desired duty cycle to produce a carrier of a duty cycle for infrared transmission;

    a pulse generator for receiving low time and high time values from an external control register through an input terminal;

    a hardware modulator for respectively receiving said carrier of said duty cycle from said duty cycle selector and an output signal from said pulse generator and generating a signal of a desired waveform for infrared transmission after a logic operation thereof;

    a multiplexer for respectively receiving said signal of said desired waveform from said hardware modulator and a data output signal and producing a selected output signal under control of a select control signal; and

    an output buffer connected to an output terminal of said multiplexer for transferring data to an output terminal of said integrated circuit.

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