INPUT/OUTPUT PORT CAPABLE OF OPERATING BIT

摘要

PURPOSE: An input/output port capable of setting a bit operation control area to a surplus data bus area, designating a bit position with a double 3 bits, selecting an operating function with higher 2 bits in order to perform a bit operation in a surplus data bus which a hardware is absent is provided. CONSTITUTION: The input/output port comprising: a data bus including a plurality of bits; a register(11) for storing port data; a port driver(21) for outputting the port data stored in the register(11) into a pin; an input gate(31) for providing the port data from the register(11) into an inner data bus; and a bit operating controller(40) for executing a bit operation function by using a surplus data bus area among the data bus.