Assembly Language Programming Of 8085

Assembly Language Programming of 8085 Unit-2

Topics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1. Introduction ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

A Machine language program to add two numbers ,[object Object],[object Object],[object Object],[object Object],[object Object]

Assembly Language of 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Assembly language program to add two numbers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Microprocessor understands Machine Language only! ,[object Object],[object Object],Assembly Language Program Assembler Program Machine Language Code

Low-level/High-level languages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2. Programming model of 8085 16-bit Address Bus 8-bit Data Bus Control Bus Accumulator ALU Flags Instruction Decoder Register Array Memory Pointer Registers Timing and Control Unit

16- Lines Unidirectional 8- Lines Bidirectional Program Counter (PC) (16-bit) Stack Pointer (SP) (16-bit) L (8-bit) H (8-bit) E (8-bit) D (8-bit) C (8-bit) B (8-bit) Flag Register (8-bit) A ccumulator (8-bit) CY P AC Z S

Overview: 8085 Programming model ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3. Instruction Set of 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1. Data Transfer (Copy) Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Data Transfer (Copy) Operations / Instructions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2. Arithmetic Operations ,[object Object],[object Object],[object Object]

Example Arithmetic Operations / Instructions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3. Logical & Bit Manipulation Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Logical & Bit Manipulation Operations / Instructions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

4. Branching Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Branching Operations / Instructions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

5. Machine Control Instructions ,[object Object],[object Object],[object Object]

4. Writing a Assembly Language Program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Program 8085 in Assembly language to add two 8-bit numbers and store 8-bit result in register C . ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3. Algorithm Translation to 8085 operations ,[object Object],[object Object],[object Object],[object Object]

4. Make a Flowchart Start Load Registers D, E Copy D to A Add A and E Copy A to C Stop ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

5. Assembly Language Program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],MVI D, 2H MVI E, 3H MOV A, D ADD E MOV C, A HLT

Program 8085 in Assembly language to add two 8-bit numbers. Result can be more than 8-bits. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],0 10011001 10011001 A B + 99H 99H 10011001 A 1 CY 00110010 99H 32H

[object Object],10011001 A 32H 1 CY Register C Register B ,[object Object],[object Object],[object Object],[object Object]

2. Program Logic ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3. Algorithm Translation to 8085 operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

4. Make a Flowchart Start Load Registers D, E Copy D to A Add A and E Copy A to C Stop If CARRY NOT SET Clear B Increment B False True

5. Assembly Language Program MVI D, 2H MVI E, 3H MOV A, D ADD E MOV C, A HLT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],JNC END MVI B, 0H INR B END:

4. Addressing Modes of 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1. Register Addressing ,[object Object],[object Object],[object Object],[object Object]

2. Immediate Addressing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3. Memory Addressing ,[object Object],[object Object],[object Object],[object Object]

3(a) Direct Addressing ,[object Object],[object Object],[object Object],[object Object]

3(b) Indirect Addressing ,[object Object],[object Object],[object Object],30H A 20H H 50H L 30H 2050H

4. Input / Output Addressing ,[object Object],[object Object],[object Object],[object Object]

5. Instruction & Data Formats ,[object Object],[object Object],[object Object],[object Object]

1. One-byte Instructions ,[object Object],[object Object],76 H 0111 0110 HLT 80 H 1000 0000 B ADD 4F H 0100 1111 C , A MOV Hex Code Binary Code Operand Opcode

1. Two-byte Instructions ,[object Object],[object Object],[object Object],06 H F2 H 0000 0110 1111 0010 B , F2H MVI 3E H 32 H 0011 1110 0011 0010 A , 32H MVI Hex Code Binary Code Operand Opcode

1. Three-byte Instructions ,[object Object],[object Object],[object Object],3A H 70 H 30 H 0011 1010 0111 0000 0011 0000 3070H LDA 21 H 50 H 20 H 0010 0001 0101 0000 0010 0000 H , 2050H LXI Hex Code Binary Code Operand Opcode

Assembly Language Programming Of 8085

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Assembly Language Programming Of 8085