Ttelmah
Joined: 11 Mar 2010 Posts: 19366
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Posted: Sun Sep 04, 2011 2:28 am |
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Read the chip's data sheet.
What interrupts are available on a chip, depend on the chip, nothing else.
Some chips allow pins like RB0...3 to be used by INT_RB. Most don't. Some of these have you able to enable/disable INT_RB, on individual pins, and in a few versions, even allow the detection direction to be detected/controlled.
So for the PIC16F1937 (for example), CCS has 'INT_RB0_L2H'.
In general, INT_EXT, responds to a specific change in level on a particular pin (direction settable separately). Normally pin B0. INT_RB, normally responds to any charge on any of the high four pins of port B. and it responds (except on some later chips), to any _change_.
Best Wishes |
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