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PIC18F4620 INT_RB question.

 
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jwt2368



Joined: 06 Mar 2010
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PIC18F4620 INT_RB question.
PostPosted: Sat Jun 26, 2010 9:13 pm     Reply with quote

I would like to utilize a portb on change interrupt.
The CCS manual says: "#INT_RB Port B any change on B4-B7".

Does this apply also to the 18F4620? It would seem logical that the interrupt should detect any pin on port b. B4-B7 limits the amount of inputs I want to detect using the ISR.

If this is indeed the case, can B6 and B7 be used as inputs when they are also used for ICSP (PGC & PGD)? Is it okay to attach buttons to these pins and use the ISR to detect off of them?

I am using the internal portb pullups and a simple spst push button to pull the inputs low when the spst's are pressed.

Thanks,
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JT
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PostPosted: Sat Jun 26, 2010 11:46 pm     Reply with quote

Quote:
The CCS manual says: "#INT_RB Port B any change on B4-B7".
Does this apply also to the 18F4620?

Yes, look in the 18F4620 data sheet in the I/O Ports section on Port B:
http://ww1.microchip.com/downloads/en/DeviceDoc/39626e.pdf

Quote:

If this is indeed the case, can B6 and B7 be used as inputs when they are
also used for ICSP (PGC & PGD)?

They can, but not while the ICD is plugged into the board.
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