A watchdog system comprises: a software area including a boot loader area and an application area; a shared memory area for storing the last watchdog refresh timing; and an external watchdog module, wherein, in response to a refresh request transmitted from one from among the boot loader area and the application area, the external watchdog module refreshes a watchdog, when the timing of the transmitted refresh request is open window timing, on the basis of the last watchdog refresh timing from the shared memory area and the timing of the transmitted refresh request.
展开▼
