Since there were regular questions about this project, and the PSoC5 is outdated since several years now, I updated the project to use the current PSoC5LP. The PSoC5 project below was done with PSoC Creator 4.2, and targets the CY8CKIT-050. Should you use the -059 PSoC5LP stick, check the pin assignments, and change the target MCU accordingly.
Also, this project does feature only the frequency counter, but no frequency generator not any input circuitry. It needs an external reference clock (13MHz, but this can be changed easily).