Device for protecting the validity of time sensitive information

Details Device for protecting the validity of time sensitive information Device for protecting the validity of time sensitive information

1993-06-23

1996-02-06

Hayes, Gail O.

Amusement devices: games

Chance devices

Electric or magnetic

380 3, 380 4, 380 25, 364700, A63B 7100, A63F 900

Patent

active

054890950

ABSTRACT:
The clock circuit is formed by an oscillator (10-12) which is coupled to a counter/divider circuit (15) provided with read accesses (30). In order to prevent falsification of its data, the circuit is formed as a protected casing and includes a protected access circuit (50) which is connected between said accesses and the counter/divider circuit. Furthermore, a circuit for monitoring the frequency of the oscillator may be provided (100-50).

REFERENCES:
patent: 3806874 (1974-04-01), Ehrat
patent: 4575621 (1986-03-01), Dreifus
patent: 5073931 (1991-12-01), Audebert et al.
patent: 5150407 (1992-01-01), Chan
patent: 5168372 (1992-12-01), Sweetser
patent: 5347579 (1994-09-01), Blandford
Data Sheet PCF8583-Philips Electronics N.V. (unknown date).
Data Sheet MC68HC05SC24-Motorola (unknown date).
FIBS PUB 46 of Jan. 15, 1977 from U.S. Dept. of Commerce/National Bureau of Standards.

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