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Er....
The analog inputs don't care whether they have 'power' or not. The ADC can still read, it'll just read zero.
The timed code will take readings at timed intervals.

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i have tes ...

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Some time ago, another user was asking how to take ADC readings at timed intervals, and I posted a complete program to do this.

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Before i use polling system to ge ...

1) Work on the KISS principle.
2) Read the forum guidelines.
3) Tell us specifically what works and what doesn't.
4) Try the CCS examples for starters, rather than cooking your own.

Mike

For ...

Your programs has several errors and things that are less than optimum,
but this one below, prevents the interrupt from working.
You have a line of code between the #int_ad statement and the AD_isr( ...

First you've got the Low Voltage Programming fuse enabled.It's unlikely you really wants this,so tell us what programmer you're using to download the code into the PIC.

2nd. Have you got the simple ...

I want read the digital value from the Analogue voltage AO pin by using AD interrrupt, and print the value on the screen. The code I wrote couldn't worked and shown below, I can't find the reason, hel ...