Hi, when the 89LPC932 enters power down mode I want it to wake up only from an external interrupt. Unfortunaltely, this is not happennig. can you help me? maybe I am missing something here in the code. void Min_Power(void) { EX0 = 0; PCONA = 0xEF; // turn off all peripherals //that can be turned off PCON |= 0x12; // switch to Power Down mode IT1 = 1; //ext. inter. 1 edge triggr. EX1 = 1; while(1); }