On Thu, 23 Nov 2000 09:36:49 -0200, you wrote:

>Hello Russell,
>
>> Using a comparator instead of the raw PIC input can help.
>
>    I've never understood what the Capture/Compare ports do and how do it
>works. Every documentation I've seen, assume you already know what a Capture
>or Compare port does.
Capture : Copies the contents of a free-running timer into a register
when an external edge is detected on an input pin. An interrupt can be
generated when the capture event has occurred.
This allows precise timing of extrenal pulse inputs with minimal
software overhead. Commonly used for infra-red remote control
reception, frequency measurement, resistance measurement (with an
extarnal capacitor) etc.

Compare : controls an external pin (set/clear/toggle) when the count
of a free-running timer reaches a certain value. Useful for generating
precise timing pulses or continuous frequency outputs, e.g. for sound,
servo pulse generation etc. Compare functions often also have PWM
modes, as the functionality is very similar.