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. opcodes-table-of-intelpdf – Download as PDF File .pdf), Text File .txt) or read online.

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The is supplied in a pin DIP package. A NOP “no operation” instruction exists, but does not modify any of the registers or flags. In other projects Wikimedia Commons. Since use of these instructions usually relates to specific hardware features, the necessary program modification would typically be nontrivial. However, it requires sheeh support circuitry, allowing simpler and less expensive microcomputer systems to be built.

An Intel AH processor.

Intel An Intel AH processor. 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.

Many of these support chips were also used with other processors.

Intel 8085

All 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register. 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.

One sophisticated instruction is XTHL, which shewt used for exchanging the register pair HL with the value stored at the address indicated by the stack pointer. Later and support was added including ICE in-circuit emulators. Trainer kits composed 885 a printed circuit board,and supporting hardware are offered by various companies. It can also accept a second zheet, allowing a limited form of multi-processor operation where both processors run simultaneously and independently.


Discontinued BCD oriented 4-bit This capability matched that of the competing Z80a popular derived CPU introduced the year before. It has a 80885 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 is a binary compatible follow up on the Sorensen in the process of developing an assembler. These instructions are written in the form of a program which is used to perform various operations such as branching, addition, subtraction, bitwise logicaland bit shift operations. All interrupts are enabled by the EI instruction and disabled by the DI instruction. Also, the architecture and instruction set of the are easy for a student to understand.

Lastly, the carry flag is set if a carry-over from bit 7 of the accumulator the MSB occurred. Subtraction and bitwise logical operations on 16 bits is done in 8-bit steps.

Opcodes of Microprocessor | Electricalvoice

A surprising number of spare card cages and processors were being sold, leading to the development of the Multibus as a separate product.

For example, multiplication is implemented using a multiplication algorithm.

Retrieved 31 May The later iPDS is a portable unit, about 8″ x 16″ x 20″, with a handle. More complex operations and other arithmetic operations must be implemented in software. Operations that have to be implemented by program code subroutine libraries include comparisons of signed integers as well as multiplication and division.

The parity flag is set according to the parity odd or even of the accumulator. 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. As in many other 8-bit processors, all instructions are encoded in a single byte including register-numbers, but excluding immediate datafor simplicity.


Views Read Edit View history. There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, A number of undocumented instructions and flags were discovered by two software engineers, Wolfgang Dehnhardt and Villy M. From Wikipedia, the free encyclopedia. Retrieved from ” https: 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.

Adding the stack pointer to HL is useful for indexing variables in recursive stack frames.

The accumulator stores the results of arithmetic and logical operations, and the flags register bits sign, zero, auxiliary carry, parity, and carry flags are set or cleared according to the results of these operations. The is a conventional von Neumann design opcde on the Intel The has extensions to support new interrupts, with three maskable vectored interrupts RST 7.

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 same three interrupts to opcpde read, the RST 7. Some instructions use HL as a limited bit accumulator.

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.