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Gursharan Singh Tatla
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Gursharan Singh Tatla
professorgstatla@gmail.com
Instruction Set of 8085
yAn instruction is a binary pattern designed inside a microprocessor to perform a specific function. yThe entire group of instructions that a microprocessor supports is called Instruction Set. y8085 has 246instructions. yEach instruction is represented by an 8-bit binary value. yThese 8-bits of binary value is called Op-Codeor
Instruction Byte.
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Classification of Instruction Set
yData Transfer Instruction yArithmetic Instructions yLogical Instructions yBranching Instructions yControl Instructions
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Data Transfer Instructions
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professorgstatla@gmail.com yThese instructions move data between registers, or between memory and registers. yThese instructions copy data from source to destination. yWhile copying, the contents of source are not modified.
Data Transfer Instructions
OpcodeOperandDescription
MOVRd, Rs
M, Rs Rd, M
Copy from source to destination.
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professorgstatla@gmail.com yThis instruction copies the contents of the source register into the destination register. yThe contents of the source register are not altered. yIf one of the operands is a memory location, its location is specified by the contents of the HL registers. yExample:MOV B, C or MOV B, M
Data Transfer Instructions
OpcodeOperandDescription
MVIRd,Data
M, Data
Move immediate 8-bit
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professorgstatla@gmail.com yThe 8-bit data is stored in the destination register or memory. yIf the operand is a memory location, its location is specified by the contents of the H-L registers. yExample:MVI B, 57H or MVI M, 57H
Data Transfer Instructions
OpcodeOperandDescription
LDA16-bit addressLoadAccumulator
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professorgstatla@gmail.com yThe contents of a memory location, specified by a 16- bit address in the operand, are copied to the accumulator. yThe contents of the source are not altered. yExample:LDA 2034H
Data Transfer Instructions
OpcodeOperandDescription
LDAXB/D Register
Pair
Load accumulator indirect
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professorgstatla@gmail.com yThe contents of the designated register pair point to a memory location. yThis instruction copies the contents of that memory location into the accumulator. yThe contents of either the register pair or the memory location are not altered. yExample:LDAX B
Data Transfer Instructions
OpcodeOperandDescription
LXIReg.pair, 16-bit
data
Load register pair immediate
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professorgstatla@gmail.com yThis instruction loads 16-bit data in the register pair. yExample:LXI H, 2034 H
Data Transfer Instructions
OpcodeOperandDescription
LHLD16-bit addressLoad H-L registers direct
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professorgstatla@gmail.com yThis instruction copies the contents of memory location pointed out by 16-bit address into register L. yIt copies the contents of next memory location into register H. yExample:LHLD 2040 H
Data Transfer Instructions
OpcodeOperandDescription
STA16-bit addressStore accumulator direct
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professorgstatla@gmail.com yThe contents of accumulator are copied into the memory location specified by the operand. yExample:STA 2500 H
Data Transfer Instructions
OpcodeOperandDescription
STAXReg. pairStore accumulator indirect
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professorgstatla@gmail.com yThe contents of accumulator are copied into the memory location specified by the contents of the register pair. yExample:STAX B
Data Transfer Instructions
OpcodeOperandDescription
SHLD16-bit addressStore H-L registers direct
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professorgstatla@gmail.com yThe contents of register L are stored into memory location specified by the 16-bit address. yThe contents of register H are stored into the next memory location. yExample:SHLD 2550 H
Data Transfer Instructions
OpcodeOperandDescription
XCHGNoneExchange H-L with D-E
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professorgstatla@gmail.com yThe contents of register H are exchanged with the contents of register D. yThe contents of register L are exchanged with the contents of register E. yExample:XCHG
Data Transfer Instructions
OpcodeOperandDescription
SPHLNoneCopy H-L pair to the Stack Pointer (SP)
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professorgstatla@gmail.com yThis instruction loads the contents of H-L pair into SP. yExample:SPHL
Data Transfer Instructions
OpcodeOperandDescription
XTHLNoneExchange HȂL with top of stack
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professorgstatla@gmail.com yThe contents of L register are exchanged with the location pointed out by the contents of the SP. yThe contents of H register are exchanged with the next location (SP + 1). yExample:XTHL
Data Transfer Instructions
OpcodeOperandDescription
PCHLNoneLoad program counter with H-L contents
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professorgstatla@gmail.com yThe contents of registers H and L are copied into the program counter (PC). yThe contents of H are placed as the high-order byte and the contents of L as the low-order byte. yExample:PCHL
Data Transfer Instructions
OpcodeOperandDescription
PUSHReg. pairPush register pair onto stack
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professorgstatla@gmail.com yThe contents of register pair are copied onto stack. ySP is decremented and the contents of high-order registers (B, D, H, A) are copied into stack. ySP is again decremented and the contents of low-order registers (C, E, L, Flags) are copied into stack. yExample:PUSH B
Data Transfer Instructions
OpcodeOperandDescription
POPReg. pairPop stack to register pair
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professorgstatla@gmail.com yThe contents of top of stack are copied into register pair. yThe contents of location pointed out by SP are copied to the low-order register (C, E, L, Flags). ySP is incremented and the contents of location are copied to the high-order register (B, D, H, A). yExample:POP H
Data Transfer Instructions
OpcodeOperandDescription
OUT8-bit port
address
Copy data from accumulator to a port with 8-
bit address
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[PDF] INSTRUCTION SET OF 8085 - EazyNotes