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Method and circuit for interfacing a modem in a wireless communication device to a subscriber interface module

  • US 20010034246A1
  • Filed: 02/02/2001
  • Published: 10/25/2001
  • Est. Priority Date: 02/04/2000
  • Status: Active Grant
First Claim
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1. A circuit for interfacing a modem in a Wireless Communication Device (WCD) to a Subscriber Interface Module (SIM), the SIM including an Input/Output (I/O) port for transmitting and receiving serial data, and a clock input for receiving a SIM clock, comprising:

  • a modem controller;

    a Universal Asynchronous Receiver/Transmitter (UART) connected to the modem controller, the UART including a transmitter and a receiver to respectively transmit data to and receive data from the SIM I/O port over a common data line; and

    a programmable clock circuit adapted to generate the SIM clock and the UART clock based on a common clock provided to the programmable clock circuit, the programmable clock circuit being adapted to generate the SIM clock and the UART clock independently of one another in response to a clock control signal from the modem controller.

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