Question

Explain the direct addressing mode of Intel 8085 with suitable examples.

Answer 1

1. Direct addressing places the address in program memory after the instruction’s opcode.
2. The instructions specify the operand’s address.
3. Instructions in direct addressing mode are three bytes long. Byte 1 is the instruction’s opcode, Byte 2 is the lower order address, and Byte 3 is the high order address.
4. For e.g., LDA 9FFFH
   i.e. This instruction loads accumulator with the content of memory address 9FFF H.