8085 — Timing Diagram Of Lhld Instruction In

: The processor reads the two-byte address from the memory locations immediately following the opcode.

: Goes high during the first T-state ( T1cap T sub 1 ) of every machine cycle to latch the lower address ( Higher Address Bus (

The (Load H and L registers direct) instruction in the 8085 microprocessor is a 3-byte instruction that loads the contents of a specific 16-bit memory address into the H-L register pair . It is one of the most complex instructions in terms of timing, requiring 5 machine cycles and 16 T-states to complete. 1. Instruction Overview Opcode : 2Bh (for LHLD) Timing Diagram Of Lhld Instruction In 8085

Increments the address by 1 and reads data into the . 3. Signal Behavior in the Timing Diagram

: 3 Bytes (Byte 1: Opcode, Byte 2: Lower-order address, Byte 3: Higher-order address) Function : : The processor reads the two-byte address from

: The PC places the address on the bus; ALE latches it. The processor fetches 2Bh . In T4cap T sub 4

To visualize the diagram, consider the following behavior of the system bus during these 16 T-states: Signal Behavior in the Timing Diagram : 3

: The processor increments the address by 1, reads the next byte, and stores it in the H register .