Electronic device and timer therefor with tamper event stamp...

Details Electronic device and timer therefor with tamper event stamp... Electronic device and timer therefor with tamper event stamp...

2007-10-23

2007-10-23

Truong, T. B. (Department: 2135)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C713S320000, C713S502000, C711S109000

Reexamination Certificate

active

10268871

ABSTRACT:
An electronic timer may include a clock reference signal generator and a real time clock (RTC) circuit for generating real time data based upon the clock reference signal. The RTC circuit may include a plurality of registers each for storing a respective bit of the real time data. Further, each register may include a master latch for initially storing the real time data bit, a slave latch for subsequently storing the real time data bit, and a user latch for storing the real time data bit from the slave latch. The RTC circuit may further include a controller for causing at least some of the registers to increment based upon the clock reference signal. Additionally, the electronic timer may also advantageously include a tamper circuit for receiving a tamper event signal and causing each of the user latches to hold a time stamp therein.

REFERENCES:
patent: 5111487 (1992-05-01), Burch
patent: 5533727 (1996-07-01), DeMar
patent: 6236197 (2001-05-01), Holdsclaw et al.
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patent: 6369719 (2002-04-01), Tracy et al.
patent: 6888472 (2005-05-01), Yoshimura et al.
patent: 7080160 (2006-07-01), Cognet et al.
STMicroelectronics Product Brochure,16 Kbit(2kb x8)Timekeeper® SRAM, Nov. 1998.
STMicroelectronics Product Brochure,Zeropower and Timekeeper NVRAMs, 1998.
STMicroelectronics, Inc.,What is a Timekeeper® NVRAM?, 2002, available at http://us.st.com.

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