Intel instruction set. x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, xA, xB, xC, xD, xE, xF. 0x, NOP 1 4 , LXI B,d16 3 10 , STAX B 1 7 , INX B 1 6 –K Opcode sheet for Microprocessor with descriptionMnemonic ACI n ADC r ADC M ADD r ADD M ADI n ANA r ANA M ANI n CALL a CC a CM a CMA CMC. tes. com. Gursharan Singh Tatla. Page 1 of 6. OPCODES TABLE OF INTEL Opcodes of Intel in Alphabetical Order. Sr. No. 1. 2. 3. 4. 5.

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Opcodes of Microprocessor | Electricalvoice

However, an circuit requires an 8-bit address latch, so Intel manufactured several opfode chips with an address latch built in. 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.

Sorensen, Villy January The screen and keyboard can be switched between them, allowing programs to be assembled on one processor large programs took awhile while files are edited in the other. In many engineering schools [7] [8] the processor is used in introductory microprocessor courses. The parity flag is set according to the parity odd or even of the accumulator.

More complex operations and other arithmetic operations must be implemented in software. For two-operand 8-bit operations, the other opcodf can be either an immediate value, another 8-bit register, or a memory cell addressed by the bit register pair HL. Views Read Edit View history.

Intel – Wikipedia

Due to the regular encoding of the MOV instruction using nearly a quarter of the entire opcode space there are redundant codes to copy a register into itself MOV B,Bfor instancewhich are of little use, except for delays.


Many of these lpcode chips were also used with other processors. SIM and RIM also allow the global interrupt mask state and the three independent RST interrupt mask states to be read, the pending-interrupt states of those opccode three interrupts to be read, the RST 7.

From Wikipedia, the free encyclopedia. Discontinued BCD oriented 4-bit An improvement over the is that the can itself drive a piezoelectric crystal directly connected to it, and a built-in clock generator generates the internal high amplitude two-phase clock signals at half the crystal frequency a 6. These are intended to be supplied by external hardware in order to invoke a corresponding interrupt-service routine, but are also often employed as fast system calls.

This page was last edited on 16 Novemberat An immediate value can also be moved into any of the foregoing destinations, using the MVI instruction.

This was typically longer than the product life of desktop computers. All interrupts are enabled by the EI instruction and disabled by the DI instruction. All 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register. Intel produced a series of development systems for the andknown as the MDS Microprocessor System.

Intel 8085

The original development system had an processor. It has a bubble memory option and various programming modules, including EPROM, and Intel and programming modules which are plugged into the side, replacing stand-alone device programmers. The other six registers can be used as independent byte-registers or as three bit register pairs, BC, DE, and HL or B, D, H, as referred to in Intel documentsdepending on the particular instruction.


Only a single 5 volt power supply is needed, like competing processors and unlike the Lastly, the carry flag is set if a carry-over from bit 7 of the accumulator the MSB occurred. The auxiliary or opxode carry flag is set if a carry-over from bit 3 to bit 4 occurred.

opcoe Retrieved 31 May As in many other 8-bit processors, all instructions are encoded in a single byte including register-numbers, but excluding immediate datafor simplicity.

A number of undocumented instructions and flags were discovered by two software engineers, Wolfgang Dehnhardt and Villy M. These instructions use bit operands and include indirect loading and storing of a word, a subtraction, a shift, a rotate, and offset operations. By using this site, you agree ipcode the Terms of Use and Privacy Policy.

Opcodes of 8085 Microprocessor

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. It is a large and heavy desktop box, about a 20″ cube in the Intel corporate blue color which includes a CPU, monitor, and a single 8-inch floppy disk drive.

Each of these five interrupts has a separate pin on the processor, a feature which permits simple systems to avoid the cost of a separate interrupt controller. All three are masked after a normal CPU reset.