Interrupt input pin

Einly · Joined: 10 Sep 2003 Posts: 60

Dear all,

I am using Pin B0 of pic16f876 to as an interrupt input pin. My signal comes from DRDY (data ready pin) from AD7716. When I place a probe on the pin (to check with an oscilloscope), the pic could not sense a high to low interrupt input. When I remove the probe, it could sense it. May I know why? How can I solve this?
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Einly

William H. Conley III · Joined: 27 May 2004 Posts: 17 Location: Tucson, AZ

Whats your code look like?

Guest · Guest

Could it be that the o-scope probe is "loading" down the pin? Try increasing the input impedance of the scope? Are you using "cheesy" probes?

Just a thought.