Modes
The NCO module can output a signal in one of the two modes.
The NCOCON register controls the mode setting for the NCO.
Fixed Duty Cycle
The Fixed Duty Cycle mode toggles the output on every accumulator overflow. As long as the adder value and clock don't change, this will result in a 50% duty cycle output.
Pulse Frequency Modulation
The Pulse Frequency Modulation mode will trigger a pulse on every accumulator overflow for a period set by three bits in the NCOCON register.
