Each instruction has a one-byte (8-bit) operation codes or opcode. With 8- bit binary opcode, a total of different operation codes can. 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 is a 3-byte instruction, the second byte specifies the low-order address and the third byte specifies the high-order address.

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. 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.

Lastly, the carry flag is set if a carry-over from bit 7 of the accumulator the MSB occurred.

A surprising number of spare card cages and processors were being sold, leading to the development of the Multibus as a separate product. A downside compared to similar contemporary designs such as the Z80 is the fact 8058 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.

A number of undocumented instructions and flags were discovered by two software engineers, Wolfgang Dehnhardt and Villy M. 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 8805 a high-precision time reference.


Exchange H and L with top of stack. The contents of a memory location, specified by a bit address ppcodes the operand, are copied to the accumulator. Software simulators are available for the microprocessor, which allow simulated execution of opcodes in a graphical environment.

Exchange H and L with D and E.

8085 Data-transfer Instructions

The is supplied in a pin DIP package. Retrieved from ” https: State signals are provided by dedicated bus control signal pins and two dedicated bus state ID pins named S0 and S1. The stack pointer register is again incremented by 1.

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

More complex operations and opcoded arithmetic operations must be implemented in software. The contents of the input port designated in the operand are read and loaded into the accumulator. A motivwting discussion is definitely worth comment. I would like to apprentice while you amend your website, how could i subscribe for a blog site?

The zero flag is set if the result of the operation was 0.

Opcodes of Intel Microprocessor in Alphabetical Order – YourTechBhai

The account helped me a acceptable ocodes. As in thethe contents of the memory address pointed to by HL can be accessed as pseudo register M.


As in many other 8-bit processors, all instructions are encoded in a single byte including register-numbers, but excluding immediate datafor simplicity. This instruction copies the contents of that memory location into the accumulator. 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.

That is a very good tip especially to those fresh to the blogosphere. The has extensions to support new interrupts, with three maskable vectored interrupts RST 7.

Teach-ICT A Level Computing OCR exam board – assembly language opcodes and operands

Adding HL to itself performs a bit arithmetical left shift with one instruction. This page was last edited on 16 Novemberat It also has a bit program counter and a bit stack pointer to memory replacing the ‘s internal stack. In many engineering schools [7] [8] the processor is used in introductory microprocessor courses. Notify me of new posts by email. I had been tiny bit acquainted of this your broadcast offered bright clear concept.

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.