Pulse Width Calculation with CN Pin of dsPIC 30F3011

• Enable Interrupt for CN5
• Create a cycle to increment a 16 or 32 bit file
• Wait for interrupt, when CN5 change state stop increment
• Multiply the value with the time
• Get result

The input change notification module provides the
dsPIC30F devices the ability to generate interrupt
requests to the processor in response to a Change-Of-
State (COS) on selected input pins. This module is
capable of detecting input Change-Of-States, even in
Sleep mode, when the clocks are disabled. There are
10 external signals (CN0 through CN7, CN17 and
CN18) that may be selected (enabled) for generating
an interrupt request on a Change-Of-State.

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