The schematic representation of the 8085 bus structure is as shown in Fig. 5. The microprocessor performs primarily four operations:

  • Memory Read: Reads data (or instruction) from memory.
  • Memory Write: Writes data (or instruction) into memory.
  • I/O Read: Accepts data from input device.
  • I/O Write: Sends data to output device.

The 8085 processor performs these functions using address bus, data bus and control bus as shown in Fig. 5.

                     

                                           Fig. 5 The 8085 bus structure