Code protection in microcontroller with EEPROM fuses

Details Code protection in microcontroller with EEPROM fuses Code protection in microcontroller with EEPROM fuses

1993-03-05

1995-11-21

Rudolph, Rebecca L.

Cryptography

Key management

Having particular key generator

380 4, G06F 1214, H04L 900

Patent

active

054695570

ABSTRACT:
A semiconductor microcontroller device is adapted to control the operation of an external system. The device includes a CPU, program memory for storing instructions to be executed by the CPU to perform its control functions, and data memory for storing data for selective retrieval by the CPU. The contents of either memory are code protected by an EEPROM fuse, and are automatically erased if the code protect state of the EEPROM fuse is sought to be reset, and the EEPROM fuse is reset only after the erasure of the memory contents.

REFERENCES:
patent: 4590552 (1986-05-01), Guttag et al.
patent: 4890263 (1989-12-01), Little
patent: 5357572 (1994-10-01), Bianco et al.

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