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Crack Philip P89C51RD2H MCU Locked Eeprom needs to pay close attention on the watchdog timer of internal system, Below Figure shows the code for initializing the watchdog timer. Module 4 can be configured in either compare mode, and the WDTE bit in CMOD must also be set. The user’s software then must periodically change (CCAP4H,CCAP4L) to keep a match from occurring with the PCA timer (CH,CL). This code is given in the WATCHDOG routine in below Figure.

PCA Watchdog Timer Initialization Code

This routine should not be part of an interrupt service routine, because if the program counter goes astray and gets stuck in an infinite loop, interrupts will still be serviced and the watchdog will keep getting reset in order to Unlock NXP MCU P89LPC915 Protected Flash. Thus, the purpose of the watchdog would be defeated. Instead, call this subroutine from the main program within 216 count of the PCA timer.

Crack Philip P89C51RD2H MCU Locked Eeprom