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Programming str9 flash while it is in sleep mode

Hi,

My code as follows:

int main()
{
   initSerialInterface();
   initWakeupInterrupt();
   gotoSleepMode();
   doDummyInstruction(96,24); //96Mhz->pll output, 24Mhz main ossilator frequency
   printf("MCU waked up\n");
   while(1);
}

After loading this code one time, I could not load any program with Keil's ulink2 debugger.
How can I solve the problem?

Thank you.