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8085 Data-transfer Instructions
Following is the table showing the list of Data-transfer instructions with their meanings.
Opcode | Operand | Meaning | Explanation |
---|---|---|---|
MOV | Rd, Sc M, Sc Dt, M |
Copy from the source (Sc) to the destination(Dt) |
This instruction copies the contents of the source register into the destination register without any alteration. Example − MOV K, L |
MVI |
Rd, data M, data |
Move immediate 8-bit |
The 8-bit data is stored in the destination register or memory. Example − MVI K, 55L |
LDA |
16-bit address |
Load the accumulator |
The contents of a memory location, specified by a 16-bit address in the operand, are copied to the accumulator. Example − LDA 2034K |
LDAX |
B/D Reg. pair |
Load the accumulator indirect |
The contents of the designated register pair point to a memory location. This instruction copies the contents of that memory location into the accumulator. Example − LDAX K |
LXI |
Reg. pair, 16-bit data |
Load the register pair immediate |
The instruction loads 16-bit data in the register pair designated in the register or the memory. Example − LXI K, 3225L |
LHLD |
16-bit address |
Load H and L registers direct |
The instruction copies the contents of the memory location pointed out by the address into register L and copies the contents of the next memory location into register H. Example − LHLD 3225K |
STA |
16-bit address |
16-bit address |
The contents of the accumulator are copied into the memory location specified by the operand. This is a 3-byte instruction, the second byte specifies the low-order address and the third byte specifies the high-order address. Example − STA 325K |
STAX |
16-bit address |
Store the accumulator indirect |
The contents of the accumulator are copied into the memory location specified by the contents of the operand. Example − STAX K |
SHLD |
16-bit address |
Store H and L registers direct | The contents of register L are stored in the memory location specified by the 16-bit address in the operand and the contents of H register are stored into the next memory location by incrementing the operand. This is a 3-byte instruction, the second byte specifies the low-order address and the third byte specifies the high-order address. Example − SHLD 3225K |
XCHG |
None |
Exchange H and L with D and E |
The contents of register H are exchanged with the contents of register D, and the contents of register L are exchanged with the contents of register E. Example − XCHG |
SPHL |
None |
Copy H and L registers to the stack pointer |
The instruction loads the contents of the H and L registers into the stack pointer register. The contents of the H register provide the high-order address and the contents of the L register provide the low-order address. Example − SPHL |
XTHL |
None |
Exchange H and L with top of stack |
The contents of the L register are exchanged with the stack location pointed out by the contents of the stack pointer register. The contents of the H register are exchanged with the next stack location (SP+1). Example − XTHL |
PUSH |
Reg. pair |
Push the register pair onto the stack |
The contents of the register pair designated in the operand are copied onto the stack in the following sequence. The stack pointer register is decremented and the contents of the high order register (B, D, H, A) are copied into that location. The stack pointer register is decremented again and the contents of the low-order register (C, E, L, flags) are copied to that location. Example − PUSH K |
POP |
Reg. pair |
Pop off stack to the register pair |
The contents of the memory location pointed out by the stack pointer register are copied to the low-order register (C, E, L, status flags) of the operand. The stack pointer is incremented by 1 and the contents of that memory location are copied to the high-order register (B, D, H, A) of the operand. The stack pointer register is again incremented by 1. Example − POPK |
OUT |
8-bit port address |
Output the data from the accumulator to a port with 8bit address |
The contents of the accumulator are copied into the I/O port specified by the operand. Example − OUT K9L |
IN |
8-bit port address |
Input data to accumulator from a port with 8-bit address |
The contents of the input port designated in the operand are read and loaded into the accumulator. Example − IN5KL |