timer.h (16F877A-Showtime)

#ifndef __TIMER_H
    #define __TIMER_H
    //dinh nghia bien
    //source la xung noi hay xung ngoai (INTERNAL hay EXTERNAL)
    #define INTERNAL 0
    #define EXTERNAL 1
    //prescaler la thong so ti le
    #define DIV2 1
    #define DIV4 2
    #define DIV8 3
    #define DIV16 4
    #define DIV32 5
    #define DIV64 6
    #define DIV128 7
    #define DIV256 8
    //khai bao cac ham chuong trinh con
    void _InitTimer0(void); //ham cai dat TIMER0
    void _SETUP_TIMER_0(char source_signal,char prescaler); //ham cai dat gia tri ban dau cho TIMER0
    void _SET_TIMER0(unsigned char value);
#endif