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A MICROPROCESSOR Instruction Set Summary |. | |. | |. | |. | |. | |. | ______ ______ |. | _| \__/ |_ |. | --> X1 |_|1 40|_| Vcc (+5V) |. | _| |_ |. | --> X2 |_|2 39|_|. Microprocessor - Instruction Sets. Let us take a look at the programming of Microprocessor. Instruction sets are instruction codes to perform some task. It is classified into five categories.‎Data Transfer Instructions · ‎Arithmetic Instructions · ‎Control Instructions. The Intel ("eighty-eighty-five") is an 8-bit microprocessor produced by Intel and introduced . It supports the complete instruction set of the , with exactly the same instruction behavior, including all effects on the CPU flags (except for  Max. CPU clock rate‎: ‎3, 5 and 6 MHz.


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The MVI move immediate instruction can move its immediate data to any of the working registers including the accumulator or to memory.

Intel 8085

The LXI instruction load register pair immediate is even more unusual in that its immediate data is a bit value. This instruction is commonly used to load addresses into 8085 instruction sets register pair.

As mentioned previously, your program must initialize the stack pointer; LXI is the instruction most commonly used for this purpose.

Jump instructions include a bit address as part of the instruction. For example, the instruction JMP H causes a jump to 8085 instruction sets hexadecimal address by replacing the current contents of the program counter with the new value H.

Microprocessor Instruction Sets

Instructions that include a direct address require three bytes of storage: Register indirect instructions reference memory via a register pair. Some instructions use a combination of addressing modes.

A CALL instruction, for 8085 instruction sets, combines direct addressing and register indirect addressing. The direct address in a CALL instruction specifies the address of the desired subroutine; the register indirect address is the stack pointer.

Data is stored first in the registers and operations are performed by using registers in the instructions. It is used to accept the data from outside 8085 instruction sets to store in the Accumulator.

Intel - Wikipedia

IN 00H It is also used to send data stored in the Accumulator to 8085 instruction sets outside device. Here effective address is calculated by the microprocessor.

This type os addressing requires several accesses to retrieve the data which is to be loaded into the register. Instruction Set Classification Instruction is a binary pattern designated inside microprocessor to perform specific function.

The entire group of instructions are known as "Instruction 8085 instruction sets.

  • The Instruction Set
  • Microprocessor Data-transfer Instructions
  • Microprocessor programming | instruction set
  • The 8085 Instruction Set
  • 8085 Data-transfer Instructions
  • 8085 microprocessor programming | 8085 instruction set

CY is modified according to bit D0. RRC none Rotate accumulator left through 8085 instruction sets Each binary bit of the accumulator is rotated left by one position through the Carry flag.

Bit D7 is 8085 instruction sets in the Carry flag, and the Carry flag is placed in the least significant position D0. The parity flag is set according to the parity odd or even of the accumulator.

8085 instruction sets zero flag is set if the result of the operation was 0. Lastly, the carry flag is set if a carry-over from bit 7 of the accumulator the MSB occurred.


Some of them are followed by one or two bytes of data, which can be an immediate operand, a memory address, or a port number. A NOP "no 8085 instruction sets instruction exists, but does not modify any of the registers or flags.

Instruction Set 8085

Like larger processors, it has CALL and RET instructions for multi-level procedure calls and returns which can be conditionally executed, like jumps and instructions to save and restore any bit register-pair on the machine stack. There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, These are intended to be supplied by 8085 instruction sets hardware in order to invoke a corresponding interrupt-service routine, but are also often employed as fast system calls.

One sophisticated instruction is XTHL, which is used for exchanging the register pair HL with the value stored at the address indicated by the stack pointer. For two-operand 8-bit operations, the other operand can be either an immediate value, another 8-bit register, 8085 instruction sets a memory cell addressed by the bit register pair HL.