Kiste, thanks for opening my eyes, PIC18F25k50 will do my job, it has indeed the ECCP, I didn't read correctly the notes 4 and 5 at pin descriptions. Thank you again.
On Mon, Aug 2, 2021 at 8:36 AM vsurducan <[email protected]> wrote: > Hi Kiste, as far as I read my version of k50 (PIC18F25k50) does not have > ECCP it in 28 pin, I have to stick on my available stock of > microcontrollers during the inexistence at this point (Farnell, TME) of too > many options to buy immediately PIC microcontrollers. > Thanks for your solution, I think I will do it in interrupts using TMR0 > for a short timebase, count it for the needed frequency and toggle the > output pins. > Yes, indeed a CLC would be helpful with the standard CCP... > best wishes, > > On Sun, Aug 1, 2021 at 5:48 PM 'Oliver Seitz' via jallib < > [email protected]> wrote: > >> Hi! >> >> Well... almost all 28pin? Chips with suffixes like k20, k22, k50, k80, >> j11, j13, j50 and j80 do have ECCP, chips with suffixes like q40, q41, q43, >> q83, q84, k42, k83 and numerous more have CWG and/or CLC modules, which >> both allow the generation of those signals using a simple PWM. >> >> >> With the PIC18F2550, I only have one idea... Externally feed the pmw >> signal back to pins A0 and A1, set the CVRef module to somewhere in the >> middle, set comparator mode 0b110, and set one of the CxINV bits. Then you >> have the symmetric signals on C1out and C2out. It's not the most elegant >> solution, I admit... >> >> Greets, >> Kiste >> >> >> >> Am Sonntag, 1. August 2021, 14:58:43 MESZ hat vsurducan < >> [email protected]> Folgendes geschrieben: >> >> >> >> >> >> Thx Rob, the bridge mode (enhanced CCP) works only for a 40 pin device, I >> have a 28 pin device on my board. Enhanced CCP is available only on large >> size microcontroller. :( Almost all 28 pin microcontrollers suffer from >> this issue (PIC18F25k50, etc.) >> Since I need two signals with opposite phases, 50% duty cycle, whose >> frequency should be programmable between 1KHz and 2KHz I think they can be >> generated in compare mode...or perhaps in software. I also need to trigger >> an ADC read during the high level of those pulses from time to time. >> >> On Sun, Aug 1, 2021 at 2:17 PM Rob CJ <[email protected]> wrote: >> > >> > >> > Hi Vasile, >> > >> > >> > >> > >> > Not sure if I understood you correctly. If you want the PWM signals to >> be exactly the same but only inverted you can use the bridge mode for one >> of the PWM's that is when one output goes high the other goes low. >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > Kind regards, >> > >> > >> > >> > >> > Rob >> > >> > >> > >> > >> > >> > ________________________________ >> > Van: [email protected] <[email protected]> namens >> vsurducan <[email protected]> >> > Verzonden: zondag 1 augustus 2021 10:14 >> > Aan: [email protected] <[email protected]> >> > Onderwerp: [jallib] PWM versus enhanced PWM, oposite polarity output? >> > >> > >> > >> > >> > >> > Hi all, >> > >> > PIC18F2550, 28pin PIC device has only the PWM implemented, the enhanced >> PWM is available on 40/44pin devices only. However, If I want on a 28pin >> PIC two PWMs running at the same frequency, with the same duty-cycle, how >> can I generate one active high and one active low PWM signals without using >> any external inverter? No deadband between the output signals is required. >> > >> > Any experience is appreciated. >> > >> > thank you! >> > >> > >> > >> > -- >> > You received this message because you are subscribed to the Google >> Groups "jallib" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> an email to [email protected]. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/CAM%2Bj4qvHSZrsUtoF_1GcDrNS2_mup_hc5ZbYOuQu4uGw5TYuAQ%40mail.gmail.com >> . >> > >> > >> > >> > >> > -- >> > You received this message because you are subscribed to the Google >> Groups "jallib" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> an email to [email protected]. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/AM0PR07MB624142E76C9FF412EBE22FC5E6EE9%40AM0PR07MB6241.eurprd07.prod.outlook.com >> . >> > >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/CAM%2Bj4qstLOMHMLtJcLLEfywQ_%2BTYOWzEUCkLtghwrskyk%3DO%3DAg%40mail.gmail.com >> . >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/592117056.1109097.1627829331026%40mail.yahoo.com >> . >> > -- You received this message because you are subscribed to the Google Groups "jallib" group. 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