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Microcomputer

  • US 6,075,941 A
  • Filed: 01/22/1998
  • Issued: 06/13/2000
  • Est. Priority Date: 01/29/1997
  • Status: Expired due to Term
First Claim
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1. A microcomputer which is provided with a central processing unit that operates using a program stored in a read-only memory connected thereto via an internal bus, said microcomputer comprising:

  • an electrically erasable flash memory for storing an under-development version of said program which is stored in said read-only memory; and

    a debugging circuit connected via said internal bus to said central processing unit and having a dedicated input/output terminal for connection to an external emulator;

    wherein said debugging circuit comprises;

    a function of communication with said central processing unit via said internal bus;

    a function of communication with said emulator via said dedicated input/output terminal;

    a trace function of sending information on the operating condition of said central processing unit to said emulator via said dedicated input/output terminal;

    a break function of generating a debug dedicated interrupt when the operating condition of said central processing unit meets a condition preset by said central processing unit or said emulator; and

    a function of writing in said flash memory a program code sent from said emulator via said dedicated input/output terminal and reading out the contents of said flash memory and sending them to said emulator via said input/output terminal.

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