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Microcontroller with a caller identification unit

  • US 5,781,621 A
  • Filed: 02/22/1996
  • Issued: 07/14/1998
  • Est. Priority Date: 03/17/1995
  • Status: Expired due to Fees
First Claim
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1. In a microcontroller for a telecommunication device, a method for controlling a power supply to a signal demodulator of a caller identification unit within the microcontroller when the caller identification unit receives caller information from a telephone line wherein the microcontroller includes memory means, a ring detector, a carrier detector, and a display control unit, the method comprising the steps of:

  • detecting a first ring on the telephone line by the ring detector;

    enabling the power supply to the signal demodulator by a power management unit within a central processing unit based on a first control parameter of a plurality of predetermined control parameters stored in the memory means;

    thereafter, processing the caller information by the signal demodulator, based on a number of data bytes of caller information detected by the carrier detector, to provide the caller information to the display control unit; and

    disabling the power supply to the signal demodulator by the power management unit based on a second control parameter of the plurality of predetermined control parameters,wherein the second control parameter is provided by activation of a no carrier detect flag when the carrier detector does not detect a carrier with caller information.

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