US 2003/0159027 A1 · Microcomputer for apparatus control and vehicle-mounted electronic control unit incorporating microcomputer

Abstract

A microcomputer which is to be utilized in a condition of being built into an apparatus such as a vehicle ECU, includes a ROM having stored therein a program which is prepared by a user and a boot ROM which stores an initialization program for performing at least essential initialization processing which is required for all application programs that will be executed by the microcomputer. The need for the user to generate program contents relating to such initialization processing is thereby eliminated, while increased reliability of operation of the microcomputer is achieved. In addition, it is possible for user-specified initialization data to be read out from a user program and utilized in a part of the initialization processing of the initialization program.

Claims20

Dependent claims

A microcomputer which operates under a condition of being built into an apparatus which is controlled thereby, the microcomputer having a CPU (Central Processing Unit), and a user ROM (Read-Only Memory) having stored therein a user program which is executed by said CPU and has been prepared by a user, wherein said microcomputer comprises

a boot ROM having stored therein an initialization program which is accessed and executed by said CPU prior to executing said user program, immediately after said CPU has been released from a reset condition, said initialization program being executed by said CPU to perform initialization processing which is necessary for enabling said CPU to execute said user program.

Dependencies are inferred from the claim text.

Microcomputer for apparatus control and vehicle-mounted electronic control unit incorporating microcomputer

Life of this patent

Microcomputer for apparatus control and vehicle-mounted electronic control unit incorporating microcomputer

Life of this patent

Abstract

Claims20