time measurement between 2 pulses

[Acetronics2]

Ok, Vlad

Erroneous, erroneous ... you're joking, I hope !!! 2x10µs for a 1ms period is 2% ... use a 20 Mhz Xtal and it will be 2x2µs ... .4% !!!

The limitation is in maths involved.

You want a high precision wide range freq. meter ??? ... begin by considering your Xtals precision and The Pic Osc stability vs temp. ...

the only way is to use timers and interrupts ... with additionnal variables that extend timers range.

somewhat like you started with ...

but AT LEAST using Darrel's instant interrupts ... and probably the "N Bits maths" both from Darrel's goodies.

Alain

[xvladx]

Alain
I call erroneous when the counter pass through 65535 and then the counter start again. When de width of pulse is too big I must to handler the final count.
Please be patient with me! I´m newbie!

[xvladx]

The maximum time between pulse and pulse is of 65535 us x 2, that is 1,310s. How can I do to measure the value of the time between each pulse if this time is greater to 2 seconds, for example?

Thank you!

[xvladx]

Alain, are you there? Help me please!!