The sawtooth and the inverse sawtooth waveforms use the DAC-X-MARGIN-LOW and DAC-X-MARGIN-HIGH registers for minimum and maximum levels, respectively. Equation 9 shows that the frequency of the waveform depends on the min and max levels, CODE-STEP, and SLEW-RATE settings. An external RC load with a time constant larger than the slew-rate settings can be dominant over the internal frequency calculation. The CODE-STEP-X and SLEW-RATE-X settings are available in the DAC-X-FUNC-CONFIG register. Write 0b001 to the FUNC-CONFIG-X bit field in the DAC-X-FUNC-CONFIG register to select sawtooth waveform, and write 0b010 to select inverse sawtooth waveform.