1. Lecture 11 Z80 Instruction
Hong DGU

2. C vs Z80 Program Body
C Program #include <stdio.h> Main ( ) { . }
Z80 Program
ORG 0000H .
END

3. Two Types of Instruction
Pseudo-instruction
Assembler (or Compiler) Directive : ORG, END, …
Similar to #include in C.
Instruction
Normal instructions : LD, OUT, JP,…
Similar to printf in C.

4. Compiler and Assembler
A tool that converts human-friendly language based code to a binary code
Assembler
A tool that converts assembly code to a binary code

5. compile
assemble
Z = A + Y;
High-level
Language
Assembly
Language
Machine
Language

6. ORG
Format : ORG ADRS
Example : ORG 8000H

7. END
Format : END

8. Addressing Mode Immediate operand Direct address Indirect address
Operand is data itself (like a constant)
Direct address
Operand is address (or register name) for the real data
Indirect address
Operand is the address of the address for the real data

9. LD (Load) Format : LD target source Ex) LD A, 00000001B
immediate operand
Ex) LD (8000H), A
( ) for an operand means
direct addressing.

10. OUT
Format : OUT target source
Example : OUT ( B), A