There are 5 types of instructions sets are available in the 8085 microprocessor. Today we are going to learn about the data transfer instructions in 8085 microprocessor.
Data transfer instructions in 8085 microprocessors are used to move data between processor registers, memory, and I/O devices.
Data transfer instructions copied data from source to destination without modifying the contents of the source.
The various types of data transfer that are possible between direct data, registers, and memory locations are as follows:
|Sr. No||Data Transfer||Example|
|1.||Between registers||Register B -> Register D|
|2.||Specific data byte to register or a memory location||Data Byte -> Register B|
|3.||Between memory location and register||Memory Location -> Register A|
|4.||Between the I/O device and the accumulator||Input Device -> Register A|
|5.||Between a register pair and the stack||Register Pair data -> Stack Location|
The data transfer instructions in 8085 include the following instructions:
|1.||MOV Rd, Rs||2.||MOV R, M||3.||MOV M, R|
|4.||MVI R, data||5.||MVI M, data||6.||LXI Rp, 16-bit data|
|7.||LDA address||8.||STA address||9.||LHLD address|
|10.||SHLD address||11.||LDAX Rp||12.||STAX Rp|
Now, we will see each instruction which we have to describe above table in detail.
MOV Rd, Rs
|Mnemonics||MOV Rd, Rs|
|Operation||Rd = Rs|
|No. of Bytes||1 byte|
|Machine Cycles||1 (OF)|
|Algorithm||Rd <- Rs|
|Flags||No flags are modified|
|Addr. Mode||Register addressing mode|
|Description||This instruction copies data from source register Rd to the destination register Rs.|
The source register Rd and destination register Rs can be any general-purpose register like A, B, C, D, E, H, or L.
The contents of the source register remain unchanged.
MOV C, M
|This instruction will copy the contents of register C to register B. The contents of register C remain unchanged.|
Example MOV B, C
Suppose B = 20H, C = 10H and the instruction MOV B, C is executed. After the execution B 10H and C= 10H.
Machine Cycle Details:
- Opcode Fetch : For this cycle the addressgiven by program counter. The program counter places the address on the lower order address bus and the higher order address bus. The program counter is incremented by one to point to next instruction.
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