Rewriting protection of a size varying first region of a reprogr

Details Rewriting protection of a size varying first region of a reprogr Rewriting protection of a size varying first region of a reprogr

1997-04-08

1999-11-23

Thai, Tuan V.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711152, 711173, 36518529, 36518533, 36518901, G06F 1200, G11C 700

Patent

active

059918497

ABSTRACT:
A program for rewriting data in an address region B is written in an address region A which can be rewritten by an external PROM writer. After resetting the microcomputer and rewriting the program in address region A, the reset state is cancelled and the last address in address region A of the EEPROM (1) is then stored in a register (17). An address detector (18) prohibits rewriting in address region A based on an address value stored in the register (17).

REFERENCES:
patent: 4502115 (1985-02-01), Eguchi
patent: 5093909 (1992-03-01), Saito
patent: 5097445 (1992-03-01), Yamauchi
patent: 5408672 (1995-04-01), Miyazawa et al.
patent: 5566309 (1996-10-01), Tamura
patent: 5592641 (1997-01-01), Fandrich et al.
patent: 5657467 (1997-08-01), Hasegawa
patent: 5678082 (1997-10-01), Miyazawa et al.
patent: 5845332 (1998-12-01), Inoue et al.

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