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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. opcodes-table-of-intelpdf – Download as PDF File .pdf), Text File .txt) or read online.

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Intel An Intel AH processor. Exceptions include timing-critical code and code that is sensitive aheet the aforementioned difference in the AC flag setting or differences in undocumented CPU behavior. Later an external box was made available with two more floppy drives. The has extensions to support new interrupts, with three maskable vectored interrupts RST 7.

Opcodes of Microprocessor | Electricalvoice

However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems to be built. Adding the stack pointer to HL is useful for indexing variables in recursive stack frames. 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.

Opcoed many engineering schools [7] [8] the processor is used in introductory microprocessor courses.

A surprising number of spare card cages and processors were being sold, leading to the development of the Multibus as a separate product. The is a binary compatible follow up on the All three are masked after a normal CPU reset. All interrupts are enabled by the EI instruction and disabled by the DI instruction.

The Intel ” eighty-eighty-five ” is an 8-bit microprocessor produced by Intel and introduced in 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.

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Intel 8085

Subtraction and bitwise logical operations on 16 bits is done in 8-bit steps. All data, control, and address signals are available on dual pin headers, and a large prototyping area is provided. Only a single 5 volt power supply is needed, like competing processors and unlike the The same is not true of the Z The incorporates the functions of the clock generator and the system controller on chip, increasing the level of integration.

Sorensen in the process of developing an assembler. 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. These instructions use bit operands and include indirect loading and storing of a word, a subtraction, a shift, a rotate, and offset operations. There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, The sign flag is set if sehet result has a negative sign i.

A number of undocumented instructions and flags were discovered by two software engineers, Wolfgang Dehnhardt and Villy M.

The other six registers can be used as independent byte-registers or as three bit register pairs, BC, DE, and HL or Shert, D, H, as referred to in Intel documentsdepending on the particular instruction. Intel produced a series of development systems for the andknown as the MDS Microprocessor System.

Opcodes of 8085 Microprocessor

The original development system had an processor. Adding HL to itself performs a bit arithmetical left shdet with one instruction. Since use of these instructions usually relates to specific hardware features, the necessary program modification would typically shert nontrivial. All 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register.

Once designed into such products as sjeet DECtape II controller and the VT video terminal in the late s, the served for new production throughout the lifetime of those products.

Some instructions use HL as a limited bit accumulator. Pin 39 is used as the Hold pin. State signals are provided by dedicated bus control signal pins and two dedicated bus state ID pins named S0 and S1. A NOP “no operation” instruction exists, but does not modify any of the registers or flags. 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.


These kits usually include complete documentation allowing a student to go from soldering to assembly language programming in a single course. 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. Discontinued BCD oriented 4-bit Also, the architecture and instruction set of the are easy for a student to understand.

Retrieved from ” https: For example, multiplication is implemented using a multiplication algorithm. 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. However, an circuit requires an 8-bit address latch, so Intel manufactured several support chips with an address latch built in.

The uses approximately 6, transistors. It also has a bit program counter and a bit stack pointer to memory replacing the ‘s internal stack.

From Wikipedia, the free encyclopedia. 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.