Microcomputer having EEPROM provided with detector for detecting data write request issued before data write operation responsive to preceding data write request is completed

摘要: A microcomputer includes a central processing unit (CPU) and an electrically erasable programmable nonvolatile memory (EEPROM) fabricated on single semiconductor chip. When CPU issues data write request to EEPROM, control circuit is initiated perform write-processing in which address of EEPROM selected by first erased thereafter from written into that address. There further provided over-written detection for detecting another while the performing producing over-write signal CPU.