Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Patent
1996-10-15
1998-09-15
Donaghue, Larry D.
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
34082534, 39518701, G06F 506
Patent
active
058095446
ABSTRACT:
A microcontroller (100) with an expansion port (112) includes internal ROM (110) and EEPROM (109) and an external expansion port. The EEPROM internal to the microcontroller is programmable only when the CPU (102) is executing instructions within the internal ROM. Additionally, instructions associated with a secure operation stored in the internal ROM may not be accessed without first executing the beginning instruction of the secure operation. Attempts to begin execution of the secure operation at any point other than the legal entry address will cause the internal ROM (110) to be disabled.
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Dorsey Donald A.
Hansen Joseph M.
Donaghue Larry D.
Motorola Inc.
Vaas Randall S.
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