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Instruction type MVI M, d8 in 8085 Microprocessor
In 8085 Instruction set, this instruction MVI M, d8 is used to load a memory location pointed by HL pair with an 8-bit value directly. This instruction uses immediate addressing for specifying the data. It occupies 2-Bytes in memory.
| Mnemonics, Operand | Opcode(in HEX) | Bytes |
|---|---|---|
| MVI M, Data | 36 | 2 |
As an example, we can consider MVI M, ABH as an example instruction of this type. It is a 2-Byte instruction, with opcode for MVI M using up one Byte, and ABH using up another more Byte. We are considering that HL register pair is containing 16-bit address 4050H and content of that address initially CDH. So after execution of the instruction the updated values will be
| Before | After | |
|---|---|---|
| (HL) | (4050) | (4050) |
| (4050) | CDH | ABH |
| Address | Hex Codes | Mnemonic | Comment |
|---|---|---|---|
| 2006 | 36 | MOV M, ABH | Content of the memory location pointer by HL register pair will get updated by ABH |
| 2007 | AB | Operand ABH |
Let us check the timing diagram of this instruction MVI M, ABH
Summary − So this instruction MVI M, ABH requires 2-Bytes, 3-Machine Cycles (Opcode Fetch, Memory Read, Memory Write) and 10 T-States for execution as shown in the timing diagram.
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