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 was typically longer than the product life of desktop computers. One sophisticated instruction is XTHL, which is used for exchanging the 808 pair HL with the value stored at the address indicated by the stack pointer. By using this site, you agree to the Terms of Use and Privacy Policy. It can also accept a second processor, allowing a limited form of multi-processor operation where both processors run simultaneously and independently.

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.

Lastly, the carry flag is set if a carry-over from bit 7 of the accumulator the MSB occurred. All data, control, and address signals are available on dual pin headers, and a large prototyping area is provided.

A surprising number of spare card cages and processors were being sold, leading to the development of the Multibus as a separate product. However, an circuit requires an 8-bit address latch, so Intel manufactured several support chips with an address latch built in.

Adding HL to itself performs a bit arithmetical left shift with one instruction. The zero flag is set if the result oppcode the operation was 0. Operations that have to be implemented by program code subroutine libraries include comparisons of signed integers as well as multiplication and division.


A number of undocumented instructions and flags were discovered by two software engineers, Wolfgang Dehnhardt and Villy M. Direct copying is supported between any two 8-bit registers and between any 8-bit register and a HL-addressed memory cell, using the MOV instruction.

All three are masked after a normal CPU reset. 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. 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 0885 operations.

There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, The auxiliary or half carry flag is set if a carry-over from bit 3 to bit opcdoe occurred. State signals are provided by dedicated bus control signal pins and two dedicated bus state ID pins named S0 and S1.

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. Subtraction and bitwise logical operations on 16 bits is done in 8-bit steps. Retrieved 31 May The uses approximately 6, transistors. Adding the stack pointer to HL is useful for indexing variables in recursive stack frames. This unit uses the Multibus card cage which was intended just for the development system.

The is supplied in a pin DIP package.

Although the is an 8-bit processor, it oopcode some bit operations. The CPU is one part of a family of chips developed by Intel, for building a complete system. 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 other projects Wikimedia Commons. The internal clock is ocpode on an output pin, to drive peripheral devices or other CPUs in lock-step synchrony with the CPU from which the signal is output. Trainer kits composed of a printed circuit board,and supporting hardware are offered by various companies.


A NOP “no operation” instruction exists, but does not modify any of the registers or flags. 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. From Wikipedia, the free encyclopedia.

Intel 8085

Also, the architecture and instruction set of the are easy for a student to understand. The can also be clocked by an external oscillator making it feasible to use the in synchronous multi-processor systems using a system-wide common clock for all CPUs, or to synchronize the CPU to an external time reference such as that from a video source or a high-precision time reference.

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

Many of these support chips were also used with other processors. An Intel AH processor.

Timing Diagram – Microprocessor Course

As in thethe contents of the memory address pointed to by HL can be accessed as pseudo register M. Sorensen in the process of developing an assembler. The same is not true of the Z Intel produced a series of development systems for the andknown as the MDS Microprocessor System. For example, multiplication is implemented using a multiplication algorithm. The parity flag is set according to the parity odd or even of the accumulator. Pin 39 is used as the Hold pin. The is a conventional von Neumann design based on the Intel 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.

Later and support was added including ICE in-circuit emulators.

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