Introduction - If you have any usage issues, please Google them yourself
P89V51RD2 has a programmable watchdog timer (WDT), can be used for system fail-safe protection against software deadlock and automatic recovery. WDT in the CPU running out of control falling into the hands of the case can be used as a recovery method. P89V51RD2 has two special function register WDTC (Address 0xC0) and WDTD (Address 0x85) for the watchdog functions of these two registers, see the detailed comments
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LM19264D-AppNote-V0.1.pdf