Please refer to Page 214 of MAX32620 User Guide for the Watchdog configuration, to know the procedure.
Page 220 of the User Guide of MAX32620 (rev.C) shows WDTn_CLEAR. Commands 0xA5, 0x5A sequence are given to clear Wathchdog timer.
WDT0_clear for Watchdog Timer 0 Clear Register (Feed Dog)
WDT1_clear for Watchdog Timer 1 Clear Register (Feed Dog)