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.

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.

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.