Not in the PSoC5 world, but with a PSoC4 you can trigger an interrupt when ADC is out of given limits.
Alternatively you may use a comparator fed by a DAC to trigger an interrupt in PSoC5.
Depends on the resolution / accuracy of the trip point you need.
VDAC is limited to 8 bits.
The following methods only limited by A/D resolution and signal path
errors like Vref accuracy and A/D offsets, non linearities....
One approach would be DMA the A/D result to a register and use either
LUTs or digital comparator to generate ISR.
Or use a timer / counter, dma to the count register, and use compare output and
register to initiate an ISR.
Or create a custom component.