Multi-clock integrated circuit with clock generator and bi-directional clock pin arrangement

An integrated circuit comprising:

• a clock signal generator internal to the integrated circuit and operable to produce a plurality of clock signals;
• a pin associated with each one of the plurality of clock signals for coupling the respective clock signal to and/or from the integrated circuit;
• switch means associated with each one of the plurality of clock signals and responsive to a respective control signal to provide:
• a first mode of operation during which the respective clock signal is utilized by a device internal to the integrated circuit and during which the respective clock signal is not provided to the respective pin;
• a second mode of operation during which the respective clock signal is provided to the respective pin;
• and
• a third mode of operation during which an externally produced clock signal provided to the respective pin is utilized by the device internal to the integrated circuit;
• and
• a controller in communication with each switch means for generating the respective control signals.

A method of controlling an integrated circuit comprising:

• generating a first clock signal internal to the integrated circuit;
• generating a control signal;
• and
• providing the control signal to a switch means in communication with a bi-directional pin, the switch means responsive to the control signal to provide one mode of the following three modes:
• 1) a first mode of operation during which the first clock signal is utilized by a device internal to the integrated circuit and during which the first clock signal is not provided to the bi-directional pin;
• 2) a second mode of operation during which the first clock signal is provided to the bi-directional pin;
• and
• 3) a third mode of operation during which a second clock signal provided to the bi-directional pin from a source external to the integrated circuit is utilized by the device internal to the integrated circuit.