Port C of 8255 can function independently as:
- Input port
- Output port
- Either input or output port
- Both input and output ports

Explanation:
The 8255 is a popular Programmable Peripheral Interface (PPI) chip used in computer systems to provide parallel I/O capabilities. It has three ports: Port A, Port B, and Port C. Each port can function as either an input or an output port.

Port C:
Port C of the 8255 chip is an 8-bit bi-directional port. It can be used as either an input port or an output port independently. This means that each bit of Port C can be configured individually as an input or an output.

When configured as an input port, Port C can receive data from external devices. The values of the input bits can be read by the microprocessor to perform further operations or make decisions based on the received data.

When configured as an output port, Port C can send data to external devices. The microprocessor can write values to the output bits of Port C, which will be transferred to the connected devices.

Configuring Port C:
The configuration of Port C as an input or an output port is done by programming the control register of the 8255 chip. The control register allows the microprocessor to specify the mode of operation for each port and the direction of data transfer.

By setting the appropriate bits in the control register, the microprocessor can configure Port C as an input port, an output port, or a combination of both.

Conclusion:
In summary, Port C of the 8255 chip can function independently as either an input or an output port. It can be configured through the control register to operate in the desired mode, allowing the microprocessor to communicate with external devices by receiving or sending data through Port C.