Counter 0 Source Signal
You can select any PFI as well as many other internal signals as the Counter 0 Source (Ctr0Source) signal. The Ctr0Source signal is configured in edge-detection mode on either the rising or falling edge. The selected edge of the Ctr0Source signal increments and decrements the counter value depending on the application the counter is performing.
You can export the Ctr0Source signal to the PFI 8/CTR 0 SOURCE pin, even if another PFI is inputting the Ctr0Source signal. This output is set to high-impedance at startup.
The following figure shows the timing requirements for the Ctr0Source signal.
The maximum allowed frequency is 20 MHz, with a minimum pulse width of 10 ns high or low. There is no minimum frequency.
For most applications, unless you select an external source, the 20MHzTimebase signal or the 100kHzTimebase signal generates the Ctr0Source signal.