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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Adding HL to itself performs a bit arithmetical left shift with one instruction.

Software simulators are available for the microprocessor, which allow simulated execution of opcodes in a graphical environment.

However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems to be built. 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.

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

There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, For example, multiplication is implemented using a multiplication algorithm. All three are masked after a normal CPU reset. 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 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register. For two-operand 8-bit operations, the other opcdoe can be either an immediate value, another 8-bit register, or a memory cell addressed by the bit register pair HL.


Sorensen, Villy January 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.

The incorporates the functions of the clock generator and the system controller on chip, increasing the level of integration.

Intel 8085

The internal clock is available on an output pin, to drive peripheral devices or other CPUs in lock-step synchrony with the CPU from which the signal is output. From Wikipedia, the free encyclopedia. Each of these five interrupts has a separate pin on the processor, a feature which permits simple opfode to avoid the cost of a separate interrupt controller. All data, control, and address signals are available on dual pin headers, and a large prototyping area is provided.

Views Read Edit View history. Some instructions use HL as a limited bit accumulator. Retrieved from ” https: This unit uses the Multibus card cage which was intended just for the development system.

Operations that have to be implemented by program code subroutine libraries include comparisons of signed integers as well as multiplication and division. 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.

Exceptions include timing-critical code and code that is sensitive to the aforementioned difference in the AC flag setting or differences in undocumented CPU behavior. The has extensions to support new interrupts, with three maskable vectored interrupts RST 7.


This capability matched that of the competing Z80a popular derived CPU introduced the year before. Discontinued BCD oriented 4-bit Later and support was added including ICE in-circuit emulators.

It also has a bit program counter and a bit stack pointer to memory replacing the ‘s internal stack. Once designed into such products as the DECtape 80885 controller and the VT video terminal in the late s, the served for new production throughout the lifetime of those products.

All interrupts are enabled by the EI instruction and disabled by the DI instruction.

Opcodes of Microprocessor | Electricalvoice

This page was last edited on 16 Novemberat A NOP “no operation” instruction exists, but does not modify any of the registers or flags. An Intel AH processor. In other projects Wikimedia Commons. The parity flag is set according to the parity odd or even of the accumulator. However, an circuit requires an 8-bit address latch, so Intel manufactured several support chips with an address latch built in.

Retrieved 31 May This was typically longer than the product life of desktop computers. A downside compared to similar contemporary designs such as the Z80 is the fact that the buses require demultiplexing; however, address latches in the Intel, and memory chips allow a direct interface, opcodde an along with these chips is almost a complete system. Intel An Intel AH processor. These kits usually include complete documentation allowing a student to go opcoode soldering to assembly language programming in a single course.