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Clock Selection
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3. Check the CPU-CLK EN box and Select desired frequency from the drop down menu.
Figure 10. Clock Options
4. In the GUI and on the TDC1000 tab, select a clock divider from the TX_FREQ_DIV register. Note the
transducer's resonant frequency = (external clock) / (TX_FREQ_DIV). For example, if the transducer's
resonant frequency is 500kHz, and a CPU clock of 2MHz is chosen, then the TX_FREQ_DIV needs to
be 4.
Figure 11 shows possible excitation pulses using the CPU clock or on-board oscillator of 8MHz.
16 TDC1000-GASEVM and TDC1000-BSTEVM Kit User’s Guide SNIU026A – March 2015 – Revised December 2015
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