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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This unit uses the Multibus card cage which was intended just for the development system.

The Intel ” eighty-eighty-five ” is an 8-bit microprocessor produced by Intel and introduced in Although the is an 8-bit processor, it has some bit operations. The 80085 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.

Intel An Intel AH processor. 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 be read, the RST 7. Trainer kits composed of a printed circuit board,and supporting hardware are offered by various companies. Also, the architecture and instruction set of the are easy for a ppcode to understand. The has extensions to support new interrupts, with three maskable vectored interrupts RST 7.

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.

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

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. A surprising number of spare card cages and processors were being sold, leading to the development of the Opcodr as a separate product. However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems to be built.

Intel 8085

There are also eight one-byte call instructions RST for subroutines located at the ocpode addresses 00h, 08h, 10h, The sign flag is set if the result has a negative sign i. Only a single 5 volt power supply is needed, like competing processors and unlike the The CPU is one part of a family of chips developed by Intel, for building a complete system.


The only 8-bit ALU operations that can have a destination other than the accumulator are the unary incrementation or decrementation instructions, which can operate on any 8-bit register or on memory addressed by HL, as for two-operand 8-bit operations. Subtraction and bitwise logical operations on 16 bits is done in 8-bit steps.

Opcodes of Microprocessor | Electricalvoice

Retrieved from ” https: All three are masked after a normal CPU reset. 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. Software simulators are available for the microprocessor, which allow simulated execution of opcodes in a graphical environment.

All 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register. The same is not true of the Z These kits usually include complete documentation allowing a student to go from soldering to assembly language programming in a single course. 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.

It can also accept a second processor, allowing a limited form of multi-processor operation where both processors run simultaneously and independently. A NOP “no operation” instruction exists, but does not modify any of the registers or flags. The is a binary compatible follow up on the It also has a bit program counter and a bit stack pointer to memory replacing the ‘s internal stack.

Opcodes of 8085 Microprocessor

Operations that have to be implemented by program code subroutine libraries include comparisons of signed integers as well as multiplication and division. 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. This page was last edited on 16 Novemberat By using this site, you agree to the Terms of Use and Privacy Policy. Later and support was added including ICE in-circuit emulators.


The is a conventional von Neumann design based on the Intel 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.

As in o;codethe contents of the memory address pointed to by HL can be accessed as pseudo register M. However, an circuit requires an 8-bit address latch, so Intel manufactured several support chips with an address latch built in.

Unlike the it does not multiplex state signals onto the data bus, but the 8-bit data bus is instead multiplexed with the lower 8-bits of the bit address bus to limit the number of pins to The incorporates the functions of opcodee clock generator and the system controller on chip, increasing the level of integration.

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. 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.

Some instructions use HL as a limited bit accumulator.

Retrieved 31 May 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.

Views Read Edit View history. A downside opvode 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, so an along with these chips is almost a complete system.

The is supplied in a pin DIP 8058. The original development system had an processor. Sorensen in the process of developing an assembler. For two-operand 8-bit operations, the other operand can be either an immediate value, another 8-bit register, or a memory cell addressed by the bit register pair HL.