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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
You really, really need to read the manual. You may even need to read it several times. This thread went this long because of the above Erik
Erik, thank you very much for your help. I am not an expert in programming. I have read the manual, in fact I have printed it out. Thank you