8254.h

Go to the documentation of this file.

void init_8254();

#define FOSC            1193182         // Frec del oscilador interno
#define FINTERRUPCION   100             // Frec de interrupción (10 ms)
#define CUENTA          FOSC / FINTERRUPCION

#define BASE_8254       0x40
#define COUNTER0        BASE_8254
#define COUNTER1        BASE_8254+1
#define COUNTER2        BASE_8254+2
#define CWR             BASE_8254+3

// Control Word Register
#define COUNTER_0       0<<6
#define COUNTER_1       1<<6
#define COUNTER_2       2<<6
#define READ_BACK       3<<6
#define COUNT_LATH_CMDS 0<<4
#define LSB             1<<4
#define MSB             2<<4
#define LSB_MSB         3<<4
#define MODO0           0<<1
#define MODO1           1<<1
#define MODO2           2<<1
#define MODO3           3<<1
#define MODO4           4<<1
#define MODO5           5<<1
#define BCD             1

---