Microcontroller available for remote transmission
AssigneeElan Microelectronics Corporation
InventorsYia-Min Jue, Wen-Yuh Shieh
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Abstract
An integrated circuit includes a frequency prescaler for producing an infrared transmission carrier; a duty-cycle selector for adjustably setting the carrier's duty cycles; as well as a pulse generator and hardware modulator to generate a signal of desired waveform for infrared transmission. The integrated circuit also includes a multiplexer for receiving the signal of desired waveform from the hardware modulator and a data output signal in producing a selected output signal responsive to a control signal. The integrated circuit further includes an output buffer coupled to the multiplexer for transferring data to an output terminal.
Claims5
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.
Dependencies are inferred from the claim text.