Patent ID: 7334167

Claim:
A circuit for detection of internal microprocessor watchdog device execution in a microprocessor system comprising a microprocessor having a reset input, an internal watchdog device generating a reset signal and connected to the reset input, and an input/output line WDOG_PIO transmitting information about microprocessor reset independently from the reset signal; a device for resetting the microprocessor system and having an activation input, a system reset output connected to the reset input of the microprocessor and configured to generate a system reset signal at the system reset output responsively to an activation input signal received at the activation input; a flip-flop having a clock input CK connected to the input/output line WDOG_PIO of the microprocessor, a data input D and an inverted reset input /R connected to the system reset output of the device for resetting the microprocessor system, and an inverted flip-flop output /Q connected to the activation input of the device ( 19 ) for resetting the microprocessor system.