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registers (C, E, L, Flags) are copied into stack Example: PUSH B Page 19 Data Transfer Instructions Opcode

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Gursharan Singh Tatla

professorgstatla@gmail.com www.eazynotes.com1

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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professorgstatla@gmail.com yThe contents of accumulator are copied into the I/O port. yExample:OUT 78 H

Data Transfer Instructions

OpcodeOperandDescription

IN8-bit port

address

Copy data to accumulator from a port with 8-

bit address

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professorgstatla@gmail.com yThe contents of I/O port are copied into accumulator. yExample:IN 8C H

Arithmetic Instructions

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professorgstatla@gmail.com yThese instructions perform the operations like: yAddition ySubtract yIncrement yDecrement

Addition

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professorgstatla@gmail.com yAny 8-bit number, or the contents of register, or the contents of memory location can be added to the contents of accumulator. yThe result (sum) is stored in the accumulator. yNo two other 8-bit registers can be added directly. yExample:The contents of register B cannot be added directly to the contents of register C.

Subtraction

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professorgstatla@gmail.com yAny 8-bit number, or the contents of register, or the contents of memory location can be subtracted from the contents of accumulator. yThe result is stored in the accumulator. form. yNo two other 8-bit registers can be subtracted directly.

Increment / Decrement

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professorgstatla@gmail.com yThe 8-bit contents of a register or a memory location can be incremented or decremented by 1. yThe 16-bit contents of a register pair can be incremented or decremented by 1. yIncrement or decrement can be performed on any register or a memory location.

Arithmetic Instructions

OpcodeOperandDescription

ADDR M

Add register or memory to accumulator

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professorgstatla@gmail.com yThe contents of register or memory are added to the contents of accumulator. yThe result is stored in accumulator. yIf the operand is memory location, its address is specified by H-L pair. yAll flags are modified to reflect the result of the addition. yExample:ADD B or ADD M

Arithmetic Instructions

OpcodeOperandDescription

ADCR M

Add register or memory to accumulator with

carry

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professorgstatla@gmail.com yThe contents of register or memory and Carry Flag (CY) are added to the contents of accumulator. yThe result is stored in accumulator. yIf the operand is memory location, its address is specified by H-L pair. yAll flags are modified to reflect the result of the addition. yExample:ADC B or ADC M

Arithmetic Instructions

OpcodeOperandDescription

ADI8-bit dataAdd immediate to accumulator

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professorgstatla@gmail.com yThe 8-bit data is added to the contents of accumulator. yThe result is stored in accumulator. yAll flags are modified to reflect the result of the addition. yExample:ADI 45 H

Arithmetic Instructions

OpcodeOperandDescription

ACI8-bit dataAdd immediate to accumulator with carry

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professorgstatla@gmail.com yThe 8-bit data and the Carry Flag (CY) are added to the contents of accumulator. yThe result is stored in accumulator. yAll flags are modified to reflect the result of the addition. yExample:ACI 45 H

Arithmetic Instructions

OpcodeOperandDescription

DADReg. pairAdd register pair to H-L pair

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professorgstatla@gmail.com yThe 16-bit contents of the register pair are added to the contents of H-L pair. yThe result is stored in H-L pair. yIf the result is larger than 16 bits, then CY is set. yNo other flags are changed. yExample:DAD B

Arithmetic Instructions

OpcodeOperandDescription

SUBR M

Subtract register or memory from accumulator

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yThe contents of the register or memory location are subtracted from the contents of the accumulator.

yThe result is stored in accumulator. yIf the operand is memory location, its address is specified by H-L pair. yAll flags are modified to reflect the result of subtraction. yExample:SUB B or SUB M

Arithmetic Instructions

OpcodeOperandDescription

SBBR M

Subtract register or memory from accumulator

with borrow

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yThe contents of the register or memory locationand Borrow Flag (i.e. CY)are subtracted from the contents of the accumulator.

yThe result is stored in accumulator. yIf the operand is memory location, its address is specified by H-L pair. yAll flags are modified to reflect the result of subtraction. yExample:SBB B or SBB M

Arithmetic Instructions

OpcodeOperandDescription

SUI8-bit dataSubtract immediate from accumulator

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professorgstatla@gmail.com yThe 8-bit data is subtracted from the contents of the accumulator. yThe result is stored in accumulator. yAll flags are modified to reflect the result of subtraction. yExample:SUI 45 H

Arithmetic Instructions

OpcodeOperandDescription

SBI8-bit dataSubtract immediate from accumulator with borrow

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professorgstatla@gmail.com yThe 8-bit data and the Borrow Flag (i.e. CY) is subtracted from the contents of the accumulator. yThe result is stored in accumulator. yAll flags are modified to reflect the result of subtraction. yExample:SBI 45 H

Arithmetic Instructions

OpcodeOperandDescription

INRR M

Increment register or memory by 1

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professorgstatla@gmail.com yThe contents of register or memory location are incremented by 1. yThe result is stored in the same place. yIf the operand is a memory location, its address is specified by the contents of H-L pair. yExample:INR B or INR M

Arithmetic Instructions

OpcodeOperandDescription

INXRIncrement register pair by 1

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professorgstatla@gmail.com yThe contents of register pair are incremented by 1. yThe result is stored in the same place. yExample:INX H

Arithmetic Instructions

OpcodeOperandDescription

DCRR M

Decrement register or memory by 1

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professorgstatla@gmail.com yThe contents of register or memory location are decremented by 1. yThe result is stored in the same place. yIf the operand is a memory location, its address is specified by the contents of H-L pair. yExample:DCR B or DCR M

Arithmetic Instructions

OpcodeOperandDescription

DCXRDecrement register pair by 1

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professorgstatla@gmail.com yThe contents of register pair are decremented by 1. yThe result is stored in the same place. yExample:DCX H

Logical Instructions

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professorgstatla@gmail.com yThese instructions perform logical operations on data stored in registers, memory and status flags. yThe logical operations are: yAND yOR yXOR yRotate yCompare yComplement

AND, OR, XOR

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professorgstatla@gmail.com yAny 8-bit data, or the contents of register, or memory location can logically have yAND operation yOR operation yXOR operation with the contents of accumulator. yThe result is stored in accumulator.

Rotate

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professorgstatla@gmail.com yEach bit in the accumulator can be shifted either left or right to the next position.

Compare

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professorgstatla@gmail.com yAny 8-bit data, or the contents of register, or memory location can be compares for: yEquality yGreater Than yLess Than with the contents of accumulator. yThe result is reflected in status flags.

Complement

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professorgstatla@gmail.com yThe contents of accumulator can be complemented. yEach 0 is replaced by 1 and each 1 is replaced by 0.

Logical Instructions

OpcodeOperandDescription

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