IC card having a monitor timer and a reset signal discrimination

Details IC card having a monitor timer and a reset signal discrimination IC card having a monitor timer and a reset signal discrimination

1992-07-28

1993-09-21

Weinhardt, Robert A.

Registers

Records

Conductive

371 163, G06K 1907

Patent

active

052471632

ABSTRACT:
An IC card includes a CPU for processing data, a data receiving circuit for receiving data and inputting the data to the CPU, a data transmitting circuit for transmitting data from the CPU, a reset receiving device for receiving an external reset signal, a monitor timer for generating a timer reset signal when there is no response after a prescribed time has elapsed following receipt of data by the data receiving circuit, and a discrimination circuit for determining which of the external reset signal or a timer reset signal from the monitor timer has been received, holding the determination, and resetting the CPU in response to a reset signal.

REFERENCES:
patent: 4586179 (1986-04-01), Sirazi et al.
patent: 4597052 (1986-06-01), Matsuda
patent: 4610013 (1986-09-01), Long et al.
patent: 4924075 (1990-05-01), Tanaka
Nikkei Electronics, "Non-contact type IC card utilizing light for data communication", 1988, 10.3, No. 457, pp. 197-202.
"Watchdog Timer", Intel MCS.RTM.-96 Architectural Overview, Embedded Controller Handbook, 1987, pp. 12-40/12-41.

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