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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Opcdoe 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.

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

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, so an along with these chips is almost a complete system.

In other projects Wikimedia Commons. This was typically longer than the product life of desktop computers.

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

Opcodes of 8085 Microprocessor

The is supplied in a pin DIP package. The has extensions to support opcodee interrupts, with three maskable vectored interrupts RST 7.


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. These are intended to be supplied by external hardware in order to invoke a corresponding interrupt-service routine, but 80855 also often employed as fast system calls.

Intel 8085

Opcodw signals are provided by dedicated bus control signal pins and two dedicated bus state ID pins named S0 and S1. All 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register.

An Intel AH processor. 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.

It has a bubble memory option and various programming modules, including EPROM, opcdoe Intel and programming modules which are plugged into the side, replacing stand-alone device programmers.

The uses approximately 6, transistors. There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, 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 opvode restore any bit register-pair on the machine stack.

All data, control, and address signals are available on dual pin headers, and a large prototyping area is provided. As in thethe contents of the memory address pointed to by HL can be accessed as pseudo register M.

Timing Diagram – Microprocessor Course

Discontinued Ppcode oriented 4-bit A surprising number of spare card cages and processors were being sold, leading to the development of the Multibus as a separate product.

The later iPDS is a portable unit, about 8″ x 16″ x 20″, with a handle. Adding HL to itself performs a bit arithmetical left shift with one instruction. Sorensen, Villy January Adding the stack pointer to HL is useful for indexing variables in recursive stack frames. Later an external box was made available with two more floppy drives. The sign flag oopcode set if the result has a negative sign i.


By using this site, you agree to the Terms of Use and Privacy Policy. Trainer kits composed of a printed circuit board,8805 supporting hardware are offered by various companies. The original development system had an processor. It also has a bit program counter and a bit stack pointer to memory replacing the ‘s internal stack.

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. Some instructions use HL as a limited bit accumulator.

The zero flag is set if the result of the operation was 0. Retrieved from ” https: As in many other 8-bit processors, all instructions are encoded in a single byte including register-numbers, but excluding immediate datafor simplicity.

However, an circuit requires an 8-bit address latch, so Intel manufactured several ppcode chips with an address latch built in.

The screen ocpode 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. Also, the architecture and instruction set of the are easy for a student to understand.