8085 OPCODE PDF

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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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. Adding the stack pointer to HL is useful for indexing variables in recursive stack frames.

Opcodes of Microprocessor | Electricalvoice

Due to the regular encoding of the MOV instruction using nearly a quarter of the entire opcode space there are redundant codes to copy a register into itself MOV B,Bfor instancewhich are of little use, except for delays. An immediate value can also be moved into any of the foregoing destinations, using the MVI instruction. The is a binary compatible follow up on the As in many other 8-bit processors, all instructions are encoded in a single byte including register-numbers, but excluding immediate datafor simplicity.

Discontinued BCD oriented 4-bit 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.

Although the is an 8-bit processor, it has some bit operations.

The sign flag is set if the result has a negative sign i. It can also accept a second processor, allowing a limited form of multi-processor operation where both processors run simultaneously and independently.

From Wikipedia, the free encyclopedia. Sorensen, Villy January All interrupts are enabled by the EI instruction and disabled by the DI instruction. The zero flag is set if the result of the operation was 0. The original development system had an processor. It also has a bit program counter and a opcoe stack pointer to memory replacing the ‘s internal stack.

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Opcodes of 8085 Microprocessor

SIM and Ppcode 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.

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.

Only a single 5 volt power supply is needed, like competing processors and unlike the Like larger processors, it has CALL and RET instructions for multi-level procedure calls and returns which can be conditionally executed, like jumps and oopcode to save and restore any bit register-pair on the machine stack.

The later iPDS is a portable unit, about 8″ x 16″ x 20″, with a handle.

Intel – Wikipedia

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.

The screen and keyboard can be switched between them, allowing programs to be assembled on one opcod large programs took awhile while files are edited in the other. It has a bubble memory option and various programming modules, including EPROM, and Intel opcoee programming modules which are plugged into the side, replacing stand-alone device programmers.

All 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register. Retrieved from ” https: More complex operations and other arithmetic operations must be implemented in software.

Intel 8085

A NOP “no operation” instruction exists, but does not modify any of the registers or flags. The parity flag is set according to the parity odd or even of the accumulator. 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. A surprising number of spare card cages and processors were being sold, leading to the development of the Multibus as a separate product. 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.

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The only 8-bit ALU operations that can opfode 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.

Direct copying is supported between any two 8-bit registers and opfode any 8-bit register and a HL-addressed memory cell, using the MOV instruction.

Later an external box was made available with two more floppy drives. 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.

Since use of these instructions usually relates to specific hardware features, the necessary program modification would typically be nontrivial. However, an circuit requires an 8-bit address latch, so Intel manufactured several support chips with an address latch built in. The auxiliary or half carry flag is set if a carry-over from bit 3 to bit 4 occurred. For example, multiplication is implemented using a multiplication algorithm.

There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, This unit uses the Multibus card cage which was intended just for the development system.