The watchdog function has extensive configurability, including selecting the watchdog mode, timeout window, and activation. By default, watchdog is enabled in standby mode, but it can be disabled by setting WD_STBY_DIS (8’h14[0]) to 1b. It can be disabled altogether by setting WD_CONFIG (8’h13[7:6]) to 00b.

Each time a watchdog error occurs, the watchdog error counter is incremented, accessible through WD_ERR_CNT (8’14[4:1]). When this counter reaches the maximum value per WD_ERR_CNT_SET (8’h16[7:6]), the device transitions to restart mode, the error counter is reset back to one, and nRST is pulled low for t_{NRST_TOG-}.