P89V51RD2具有一个可编程的看门狗定时器（WDT），可用于系统故障安全保护，防止软件死锁和自动恢复。WDT在CPU落入软件运行失控的情况下可作为一种恢复的方法。P89V51RD2有两个特殊功能寄存器WDTC（地址0xC0）和WDTD（地址0x85）用于看门狗功能，有关这两个寄存器的详细注解参见-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