interrupts using pic16f877

my project requires one external interrupt .
how can i give to pic 16f877 and how can i identify that interrupt is occurs or not

thanks

pinky said:

my project requires one external interrupt .
how can i give to pic 16f877 and how can i identify that interrupt is occurs or not

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You could use one of the PortB pins for your external input, then use "Interrupt on change on PortB" - if you check the MicroChip application notes there's a fair few dealing with this. It will interrupt on any change, either positive or negative going, you can easily detect which you want in the interrupt routine - it's all explained quite well in the application notes.