Security for integrated circuit microcomputer with EEPROM

Details Security for integrated circuit microcomputer with EEPROM Security for integrated circuit microcomputer with EEPROM

1984-12-27

1987-10-06

Shaw, Gareth D.

Boots, shoes, and leggings

365218, 365185, G06F 1100

Patent

active

046987509

ABSTRACT:
An integrated circuit microcomputer with EEPROM has a limited number of modes for operation. In at least first and second modes, the inner workings of the microcomputer, including the contents of the EEPROM, can be read externally from the microcomputer. An EEPROM security bit, when set, prevents the first mode from being entered and causes the EEPROM to be erased when the second mode is entered. The EEPROM is also erased if the security bit is erased.

REFERENCES:
patent: 4005386 (1977-01-01), Seki et al.
patent: 4139893 (1979-02-01), Poland
patent: 4430709 (1984-02-01), Schleapen
patent: 4521852 (1985-06-01), Guttag
patent: 4521853 (1985-06-01), Guttag
patent: 4590552 (1986-05-01), Guttag et al.
patent: 4603381 (1986-07-01), Guttag
"Single-Chip Microcomputer Data", Motorola, Inc., 1984, pp. 3-599 to 3-622.

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