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Pin selection system for microcontroller having multiplexer selects between address/data signals and special signals produced by special function device

  • US 5,787,299 A
  • Filed: 11/18/1996
  • Issued: 07/28/1998
  • Est. Priority Date: 09/16/1994
  • Status: Expired due to Term
First Claim
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1. A pin function selection circuit for a microcontroller, comprising:

  • a configuration register having contents, said configuration register comprising an output configuration register and an input configuration register indicating a function of external pins of the microcontroller; and

    a function selection circuit connected to the configuration register, to the external pins and to microcontroller units using different input/output function signals, said function selection circuit comprising;

    a multiplex circuit connected to said output configuration register and the microcontroller units; and

    a driver circuit connected to said input configuration register, said multiplex circuit, said microcontroller units and the external pins,said multiplex circuit comprising;

    bit multiplexers connected to the microcontroller units and the driver circuit; and

    a decode unit connected to the output configuration register and the bit multiplexers.

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