System for monitoring a period of an operation clock signal...

Details System for monitoring a period of an operation clock signal... System for monitoring a period of an operation clock signal...

2006-07-18

2006-07-18

Lee, Thomas (Department: 2115)

Data processing: structural design, modeling, simulation, and em

Simulating nonelectrical device or system

Mechanical

C726S034000

Reexamination Certificate

active

07080001

ABSTRACT:
There is provided a technology for preventing disabling of function of a clock monitoring circuit by a hacker in a microcomputer for IC card provided with a clock monitoring circuit as a countermeasure for a hacker. In the microcomputer for IC card provided with the clock monitoring circuit, the clock monitoring circuit is given the function to perform the detecting operation twice during one cycle, namely at the timings of rise and fall of the clock.

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