Re: [avr-gcc-list] external interrupt use

[Ilhom Djalilov]

Hello Jamie,

Tuesday, February 24, 2004, 7:59:01 AM, you wrote:

JM> Hi all,

JM> I have 6 digital signals that I need to be able to trigger an interrupt on
JM> the falling edge and rising edge for all of them, but I am short 2 external
JM> interrupts.  Is there a simple way to detect the 6 signals rising/falling
JM> edges with 4 interrupts and some additional circuitry?  I have thought about
JM> using diodes to AND some of the signals but this only works for positive
JM> edges I think.

              INT0                INT1
       pullup  |                   |   pulldown
+5 <---/\/\/\--o-|>|---o-----|>|---o---/\/\/\--------> GND
               |       |           |
               |      signal 1     |
               o-|>|---o-----|>|---o
                       |
                      signal 2

Best regards,
 Ilhom



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