NISTC_CLK_FOUT_TIMEBASE_SEL
devpriv->clock_and_fout &= ~NISTC_CLK_FOUT_TIMEBASE_SEL;
devpriv->clock_and_fout |= NISTC_CLK_FOUT_TIMEBASE_SEL;
if (devpriv->clock_and_fout & NISTC_CLK_FOUT_TIMEBASE_SEL) {