Control system with microcomputer and associated electrically reconfigurable logic circuit

摘要

A control system adaptable for use in controlling internal combustion engines has a microcomputer and a hardware circuit reconfigurable in internal logic circuitry in such a manner that the setting of configuration is completed before the microcomputer is rendered operative upon application of a power supply voltage. The microcomputer is assembled in a 4-V guarantee circuit block with its operating guarantee power supply voltage of 4 volts. A 3-V guarantee block includes a random logic circuit and an EEPROM for storage of circuit configuration set data. The 3-V guarantee block also includes a first power-on reset circuit for providing respective sections with a reset-release command signal when an applied power supply voltage potentially rises at 3 volts, and a second power-on reset circuit for forcing the random logic circuit in the reset state until completion of the reconfiguration of the hardware circuit.