Microprocessor with protection circuits to secure the access...

Details Microprocessor with protection circuits to secure the access... Microprocessor with protection circuits to secure the access...

2006-06-27

2006-06-27

Sheikh, Ayaz (Department: 2131)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S163000, C713S193000, C726S030000

Reexamination Certificate

active

07069404

ABSTRACT:
A microprocessor is provided with protection circuits to secure access to its registers. The microprocessor includes a plurality of protection circuits, each associated with a register of the microprocessor. The protection circuits automatically block selection of the registers after each resetting of the microprocessor. The releasing of a protection circuit associated with a register is done by the successive sending, on the data bus, of N passwords proper to the register during N first operations for the selection of the register with N≧1. The selection of the register is effective only for the subsequent operations for selection of the register up to the next resetting of the microprocessor.

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