Immediate addressing mode in 8085 Microprocessor
In this mode, the 8/16-bit data is specified in the instruction itself as one of its operand. For example MVI E, ABH: means ABH is copied into register A. Here the operand is immediately available in the instruction.
| Before
| After
|
|---|
(A)
| Any value
| ABH
|
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 overwritten.
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 7T-States for execution as shown in the timing diagram.
Published on 04-Jan-2019 17:21:13
