PCC_TIMERFREQ
sc->sc_tc.tc_frequency = PCC_TIMERFREQ;
(PCC_TIMERFREQ / 100) * (cr >> PCC_TIMEROVFLSHIFT);
clock_pcc_count += PCC_TIMERFREQ / 100;
#define pcc_timer_hz2lim(hz) (0x10000 - (PCC_TIMERFREQ/(hz)))
#define pcc_timer_us2lim(us) (0x10000 - (PCC_TIMERFREQ/(1000000/(us))))