I'm using C51 V7.0 who it doesn't have support for 89LPC922. But, I copy 922.h header file and start up for lpc9xx family. I write a simple program to modify a port P17. What happened? Nothing. My program doesn't work. I program using a LABTOOL48XP. I use RC oscilator and modify startup, FOSC=3. Without use of watchdog.