Hi, I need to use the external interrupt 0 on the P89LPC932. I know I need to set up the register TCON = 0x01 for falling edge detection and then set the P1.3 as an input. and the ISR is number 0. But this interrupt pin active low. This means that a low input like ground will generate the interrupt, even if the micro is sleeping. I tried it this way and it did not work. Do you see anything wrong or missing here? thank you