Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Instruction type MVI r, d8 in 8085 Microprocessor
MVI is a mnemonic, which actually means “Move Immediate”. With this instruction,we can load a register with an 8-bitsor 1-Bytevalue. This instruction supports immediate addressing mode for specifying the data in the instruction. In the instruction “d8” stands for any 8-bit data, and ‘r’ stands for any one of the registers e.g. A, B, C, D, E, H or L. So this r can replace any one of the seven registers.
As ‘r’ can have any of the seven register names, so there are seven opcodes for this type of instruction. It occupies 2-Bytes in the memory.
| Mnemonics, Operand | Opcode | Bytes |
|---|---|---|
| MVI A, Data | 3E | 2 |
| MVI B, Data | 06 | 2 |
| MVI C, Data | 0E | 2 |
| MVI D, Data | 16 | 2 |
| MVI E, Data | 1E | 2 |
| MVI H, Data | 26 | 2 |
| MVI L, Data | 2E | 2 |
As example, if we consider instruction MVI E, ABH then it means that ABH will be moved or copied to the register E. And as a result the previous value of E will get over written.
| Address | Hex Codes | Mnemonic | Comment |
|---|---|---|---|
| 2000 | 1E | MVI E, ABH | E <- ABH |
| 2001 | AB | ABH as operand |
This instruction will have seven T-states as shown below.
Summary − So this instruction MVI E, ABH requires 2-Bytes, 2-Machine Cycles (Opcode Fetch and Memory Read) and 7 T-States for execution as shown in the timing diagram.
11K+ Views
