#define PIT_MR_OFF 0x00000000
#define PIT_MR
#define PIT_PIV 0x000FFFFF
#define PIT_PIV_LSB 0
#define PIT_PITEN 0x01000000
#define PIT_PITIEN 0x02000000
#define PIT_SR_OFF 0x00000004
#define PIT_SR
#define PIT_PITS 0x00000001
#define PIT_PIVR_OFF 0x00000008
#define PIT_PIVR
#define PIT_PIIR_OFF 0x0000000C
#define PIT_PIIR
#define PIT_CPIV 0x000FFFFF
#define PIT_CPIV_LSB 0
#define PIT_PICNT 0xFFF00000
#define PIT_PICNT_LSB 20