At 08:03 17.6.1998 +0200, you wrote:
>Hello Pavel,
>if you have a plenty of time, why not try the following:
>
>1. Capture rising edge, enter ISR, read timer for LOW
>2. Wait here until falling edge
>3. Read time for HIGH, reset timer, leave ISR
>4. Do what do you want until 1.
>
>Of course, if your duty cycle nears 100% it may be a bottleneck...

Hmm, problem is,that there is a lot of other interrupts, some of them
should be as precisely timed as possible. On the processor with normal
architecture, like Z80(accessible stack in main memory) is not a problem to
write reentrant interrupt service or there are several interrupt vectors.
But on PIC it is impossible. And because PWM cycle is relatively slow, I
can't afford to be in the interrupt routine so long.
But, thank you for help.

PavelK


**************************************************************************
* Pavel Korensky                                                         *
* DATOR3 LAN Services spol. s r.o.                                       *
* Modranska 1895/17, 143 00, Prague 4, Czech Republic                    *
*                                                                        *
* PGP Key fingerprint:  F3 E1 AE BC 34 18 CB A6  CC D0 DA 9E 79 03 41 D4 *
*                                                                        *
* SUMMA SCIENTIA - NIHIL SCIRE                                           *
**************************************************************************