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RBport on change interrupt problem

 
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RBport on change interrupt problem
PostPosted: Fri Jan 20, 2006 4:47 pm     Reply with quote
When I enable the interrupt and put the pic to sleep, it wake up and enter to the ISR before I push a key. Is there something I have to do before enable the port interrupt? I'm using the ICD debugger (with port b internal pull ups): is this the problem?

I have 16F876 PIC, 3.19 compiler version, 3.43 IDE version.

P.S: sorry for my bad english.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jan 20, 2006 5:07 pm     Reply with quote
You must read the port before you enable the interrupt.
This will clear the latch that detects the "change condition".
Then it will be setup to detect the next keypress.
JohnLeung



Joined: 18 May 2004
Posts: 15

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Interrupt on-change on RB port
PostPosted: Fri Jan 20, 2006 8:56 pm     Reply with quote
Try putting a small delay to "debounce" after wake up to avoid any noisy problem for RB on-change port, even though you have pull-up for PORTB.
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