Provided are an apparatus capable of generating a stream clock having the same frequency as a frequency in a normal mode, in a panel self-refresh mode and an embedded DisplayPort system including the same. The embedded DisplayPort system includes a stream clock generator. The stream clock generator may include an internal oscillator configured to oscillate an internal clock, a frequency regulator configured to compare frequencies of the internal clock and a link symbol clock, generate control signals, and adjust a frequency of the internal clock using the control signals, wherein the link symbol clock is reconstructed from stream data of the embedded DisplayPort system, and a phase-locked loop configured to generate a stream clock using the internal clock and lock a phase of the stream clock to a phase of the internal clock.