mf_tcdcr
MFP->mf_tcdcr &= 0x7; /* Stop timer */
MFP->mf_tcdcr = (MFP->mf_tcdcr & 0x7) | (T_Q200<<4); /* Start */
single_inst_bclr_b(MFP->mf_tcdcr, 0x07);
single_inst_bset_b(MFP->mf_tcdcr, (ospeed >> 8) & 0x0f);
single_inst_bclr_b(MFP->mf_tcdcr, 0x07);
single_inst_bset_b(MFP->mf_tcdcr, (sc->sc_ospeed >> 8) & 0x0f);
int cr = MFP2->mf_tcdcr & 7;
MFP2->mf_tcdcr = cr; /* stop timer C */
MFP2->mf_tcdcr = cr; /* start timer C */