Microcomputer having EEPROM provided with detector for detecting

Details Microcomputer having EEPROM provided with detector for detecting Microcomputer having EEPROM provided with detector for detecting

1989-11-27

1994-04-26

Dixon, Joseph L.

Static information storage and retrieval

Magnetic bubbles

Guide structure

365195, 365218, G06F 1316, G11C 700

Patent

active

053074700

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

REFERENCES:
patent: 4212057 (1980-07-01), Denlin et al.
patent: 4644494 (1987-02-01), Muller
patent: 4727363 (1988-02-01), Ishii
patent: 4774544 (1988-09-01), Tsuchiya et al.
patent: 4956795 (1990-09-01), Yamaguchi et al.
Uffenbeck, John Microcomputers and Microprocessors, 1985, pp. 194-195.

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