Cortex Digital Input Voltage

I have a question about the Cortex’s digital ports being used for digital input.

I am designing a custom sensor that will communicate using digital signal. It has its own power source, and as such It can send either 3.3V or 0V to one of the cortex’s digital ports. My question is will the cortex be able to read the inputs from the sensor? Is 3.3V high enough to be read as HIGH instead of LOW, or do I need to send 5.0V to the cortex for it to be read as HIGH?

Thanks a lot!

Per the VEX ARM® Cortex®-based Microcontroller wiki, Digital Inputs need 0.0 to 0.6 volts for a low and 2.5 to 5.0 volts for a high. You should be okay.