Peripheral port with volatile and non-volatile configuration

An integrated circuit including a peripheral port, comprising:

• an input/output pin;
• a multiplexer coupled to the input/output pin;
• a structure for providing one or more volatile configuration bits;
• a structure for providing one or more non-volatile configuration bits,
• wherein the volatile configuration bits and the non-volatile configuration bits control the multiplexer and one or more of the non-volatile configuration bits overrides one or more of the volatile configuration bits;
• a functional unit connected to the multiplexer and to the structure for providing non-volatile configuration bits, the structure for providing non-volatile configuration bits providing a particular non-volatile configuration bit which is usable to control operation of the functional unit;
• and
• a circuit which detects when the particular non-volatile configuration bit is used to control operation of the functional unit and which provides the particular non-volatile configuration bit for control of the multiplexer when the particular non-volatile configuration bit is not used to control the operation of the functional unit.

An integrated circuit including a peripheral port, comprising:

• an input/output pin;
• a multiplexer coupled to the input/output pin;
• a structure for providing one or more volatile configuration bits;
• a structure for providing one or more non-volatile configuration bits;
• a first plurality of functional units, each functional unit in the first plurality of functional units being coupled to the multiplexer;
• and
• a second plurality of functional units, each of the functional units in the second plurality of functional units being connected to the multiplexer;
• wherein the volatile configuration bits and the non-volatile configuration bits control the multiplexer and one or more of the non-volatile configuration bits overrides one or more of the volatile configuration bits such that:
• when the non-volatile configuration bits have a first value, the volatile configuration bits control the multiplexer by causing the multiplexer to route a signal between the input/output pin and a selected functional unit in the first plurality of functional units;
• and
• when the non-volatile configuration bits have a value other than the first value, the volatile configuration bits have no effect on the multiplexer and the non-volatile configuration bits control the multiplexer by causing the multiplexer to route a signal between the input/output pin and a functional unit in the second plurality of functional units.