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vlad_2770

intrebare timer

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Folosesc Timer-ul 1 ca sa numar timpul intre doua impulsuri ce vin pe un pin de la Portul B (RB5). Vreau ca timpul sa poata fi mai mare de 0,013.. secunde (folosesc un cuartz de 20MHz). Cum pot face asta? Mentionez ca lucrez cu intreruperea de pe portul B. Adica vine impulsul si se declanseaza numaratoarea.Multumesc

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stiu mai pot obtine inca o inmultire cu 8 folosind Prescalerul dar imi trebuie mai mult , un 0,5 secunde ar fi bine. multumesc

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Pai poti face asa: activezi si intreruperea la Tmr1 si folosesti inca un counter software care este resetat cand resetezi timer-ul si care este incrementat de fiecare daca cand s produce depasirea la Tmr1. Counter-ul aditional poate fi pe 8, 16 ori cati biti tu ai nevoie, in functie de durata maxima care vrei sa o masori. Timpul total va fi (cand se produce intreruperea pe RB5):counter<<16+TMR1H:TMR1L[/code]

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