Printing system, printing apparatus, and printhead

A printing system comprising:

• a printing apparatus;
• and
• a printhead including a printing element and configured to be detachable from the printing apparatus,
• the printing apparatus including:
• a data transmission unit configured to transmit, to the printhead, a clock signal of a predetermined period and a data signal synchronized with the clock signal, and
• the printhead including:
• a reception unit configured to receive the clock signal and the data signal, and
• an information transmission unit configured to transmit, to the printing apparatus, information concerning a reception result of the reception unit,
• wherein when the data transmission unit transmits control data of the printing element as the data signal, a first period is set as the predetermined period, and
• when the data transmission unit transmits, as the data signal, connection confirmation data for confirming connection of the printhead to the printing apparatus, a second period longer than the first period is set as the predetermined period.