On Thu, 22 Feb 2001, Roman Black wrote:

>                                            but I
> really need to record accurate period (freq) of
> both input signals.

Oh.

How about a hybrid solution? You can use the hardware capture for one of the
signals and software polling for the other. I've posted a software period
measurer that had 3-instruction cycle resolution (for both sampling and time
tagging):

http://www.piclist.com/techref/microchip/pulsewidth-sd.htm?key=pulse%20width&from=

The one NOP could check the capture interrupt state to see if an edge has been
caught by the hardware.

Scott

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads