TMS570LC4357: Can you generate a bipolar signal with HALCOGEN and CCS by subtracting two signals perfectly out of phase with one another? How would you go about subtracting signals in general?

The title pretty much sums it up. I'm looking to generate a bipolar square wave without external components. I'm aware that the board itself cannot generate a negative voltage without external components, and was wondering if it's possible to work around this by somehow subtracting two waves.