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

• Current Assignee: Elan Microelectronics Corporation
• Original Assignee: Elan Microelectronics Corporation
• Inventors: Jue, Yia-Min, Shieh, Wen-Yuh
• Primary Examiner(s): NGUYEN, MINH T
• Application Number:
  US10/082,102
• Publication Number:
  US 20020167370A1
• Time in Patent Office: 560 Days
• Field of Search: 725/139, 725/148, 725/151, 725/118, 332/109, 332/110, 332/117-119, 375/256, 375/238, 375/300, 375/302
• US Class Current: 332/109
• CPC Class Codes: H04B 10/503 Laser transmitters

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.

Claims

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.

2. An integrated circuit according to claim 1 wherein said output buffer has an output pin connected to an infrared LED.

3. An integrated circuit according to claim 1 wherein said integrated circuit is a general type microcontroller.

4. An integrated circuit according to claim 1 wherein said multiplexer controls selection of said data output signal by said select control signal for an output pin of said output buffer applicable for general input/output port in addition to infrared transmission.

5. An integrated circuit according to claim 1 wherein said frequency and duty cycle of said carrier is adjustable for desired application.