Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2005-04-19
2005-04-19
Padmanabhan, Mano (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S200000
Reexamination Certificate
active
06883075
ABSTRACT:
A single integrated circuit microcontroller10including embedded erasable/programmable non-volatile memory12having a read protection. Microcontroller10can operate within a special mode in which external circuits may access memory12by use of input/output pins18. When microcontroller10activates this special mode, a read protection flag13within memory12is checked. The read protection flag13may be set during production of the microcontroller10after instructional data or firmware has been installed onto memory12. If the read protection flag13has been set, the contents of memory12are erased or reprogrammed prior to allowing access to memory12. In this manner, external circuits cannot access instructional data or firmware that is stored in memory12.
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U.S. Appl. No. 10/206,635, filed Jul. 26, 2003, Fong Long Lin, et al.
Lin Fong-Long
Xu Wei
Baker Paul
DLA Piper Rudnick Gray Cary US LLP
Padmanabhan Mano
Silicon Storage Technology, Inc.
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