8086 Microprocessor Internal Architecture Diagram

8086 internal architecture:

BIU (Bus Interface Unit):-
·       It sends out tasks.
·       It fetches instructions from memory.
·       It reads data from memory and ports.
·       It also writes data from memory and ports.
·       So BIU takes care of all the address and data transfers on the buses.



Execution Unit:-
·       It tells the BIU, from where to fetch the instruction or data.
·       It decodes the fetched instructions.
·       It executes the fetched instructions.  
   EU takes care of performing operations on data.