scif_brr_write
scif_brr_write(divrnd(PCLOCK, 32 * bps) - 1);
scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * bps) - 1);
scif_brr_write(divrnd(sh_clock_get_pclock(), 32 * ospeed) -1);