ASC_CTL
mode = asc_in(port, ASC_CTL) & ASC_CTL_MODE_MSK;
if (asc_in(port, ASC_CTL) & ASC_CTL_CTSENABLE)
ctl = asc_in(port, ASC_CTL) & ~ASC_CTL_RUN;
asc_out(port, ASC_CTL, ctl);
ctrl_val = asc_in(port, ASC_CTL);
asc_out(port, ASC_CTL, (ctrl_val & ~ASC_CTL_RUN));
asc_out(port, ASC_CTL, (ctrl_val | ASC_CTL_RUN));