Input Output Operations
Many times microprocessor has to accept data from input port and send data to output port to interact with the real world. Input port is tri state buffer and output port is latch tri state buffer and latch are already discussed in chapter. These input output ports are identified by 8 bit address 8 bit port address of these input output ports may be any of the 256 combinations of 8 bit from 00H FFH. It means 8085 may communicate with 256 different input port and 256 different output ports. These input output ports are called parallel port i e 8 bit data is transferred between microprocessor and input output port. Following s instruction are used to communicate with input output.
Important: No flags are modified by input output operation.