Timing Diagram Of Lhld Instruction In 8085 «90% Plus»

: The processor places the 16-bit address it just "learned" onto the address bus. It reads the byte at that location and stores it in the L register .

(H)←[[adr+1]]open paren cap H close paren left arrow open bracket open bracket a d r plus 1 close bracket close bracket (Content of memory address moves to H) Timing Diagram Of Lhld Instruction In 8085

) : Carries the most significant bits of the memory address throughout the cycle. : Acts as the lower address bus during T1cap T sub 1 Acts as the data bus during T2cap T sub 2 T3cap T sub 3 to fetch the opcode or read memory data. Control Signals ( RD¯modified cap R cap D with bar above WR¯modified cap W cap R with bar above ) : Since LHLD is a "Load" instruction, WR¯modified cap W cap R with bar above remains high (inactive). RD¯modified cap R cap D with bar above goes low during T2cap T sub 2 T3cap T sub 3 of all five cycles to enable memory reading. Status Signals ( ) : (Memory operation). For Opcode Fetch (M1): For Memory Read (M2-M5): 4. Step-by-Step Execution : The processor places the 16-bit address it

: The processor reads the two-byte address from the memory locations immediately following the opcode. : Acts as the lower address bus during