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Absolute addressing mode in 8085 Microprocessor
In this mode, the data is directly copied from the given address to the register. This absolute addressing mode is also called a direct addressing mode. For example LDA 3000H: means the data at address 3000H is copied to register A.
LDA 4050H
Let us consider LDA 4050 Has an example instruction of this type. It is a 3-Byte instruction. The initial content of memory address 4050H is ABH. initial accumulator content is CDH. As after execution A will be initialized with value ABH. Memory location 4050H will still remain with the content ABH. The results of the execution of this instruction are as below –
| Before | After | |
|---|---|---|
| (4050) | ABH | ABH |
| A | CDH | ABH |
| Address | Hex Codes | Mnemonic | Comment |
|---|---|---|---|
| 2008 | 3A | LDA 4050H | A ← Content of the memory location 4050H |
| 2009 | 50 | Low order Byte of the address | |
| 200A | 40 | High order Byte of the address |
Here is the timing diagram of the instruction LDA 4050H –
Summary − So this instruction LDA 4050H requires 3-Bytes, 4-Machine Cycles (Opcode Fetch, Memory Read, Memory Read, Memory Read) and 1
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