A method of operating a communication system, the method comprising:
- generating an output signal in response to a common reference clock signal using a phase-locked loop, wherein the output signal is in phase lock with the common reference clock signal;
- receiving a select signal;
- selecting an edge of a rising edge of the output signal and a falling edge of the output signal in response to the select signal;
- generating a divider reset signal in response to the selected edge;
- generating a communication clock signal by performing, at a start time, frequency division of the output signal, wherein the divider reset signal controls the start time of the frequency division;
- and
- operating a transmitter of the communication system in response to the communication clock signal.