Peripheral interface circuit at host side and electronic system using the same

An electronic system, comprising:

• a host, comprising:
• a bus clock signal generator, outputting a bus clock signal based on a host clock signal and a phase shift control signal to be conveyed to a peripheral device via an interface bus as a reference for the peripheral device to output data, wherein the host clock signal and the phase shift control signal are input to the bus clock signal generator;
• and
• a data register, receiving the data output from the peripheral device and retrieved at the host side in accordance with the host clock signal,
• wherein the bus clock signal generator adjusts the bus clock signal based on how the host clock signal is phase-asynchronous to the data output from the peripheral device and retrieved at the host side in accordance with the host clock signal;
• and
• a phase shift control module, generating the phase shift control signal for the bus clock signal generator to adjust the bus clock signal.