sh_clock_get_pclock
scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * bps) - 1);
scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * ospeed) -1);
int sh_clock_get_pclock(void);
MHZ(sh_clock_get_pclock()));