In this example the PLA will cause and ADC conversion to occur if the input level to the comparator exceeds the trip point. This trip point is set by one of the on-chip DACs while the system is enabled either by an MMR bit or a GPIO pin. To implement this with discrete components would require at least 4 external ICs, whereas on the ADuC702x series of parts this can be implemented on-chip without the need for one single external component.