PSoC Designer provide multiple types of ADCs; one such ADC being ADCINC. This ADC can be configured with a resolution from 7 to 14 bits and can measure a signal from rail to rail. PSoC Designer provides a set of APIs to control the functionality of an ADC without worrying about the low level details.
The project attached demonstrates how to use an ADCINCVR to measure a 0 to 5Volt signal and display the corresponding decimal value on a character LCD. This project has been designed using CY8C29466 device and can be used for other associated part families as well (mentioned in the attached document).