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The Intel 8085 ("eighty-eighty-five") is an 8-bit microprocessor produced by Intel and introduced in March 1976. [2] It is the last 8-bit microprocessor developed by Intel. It is software-binary compatible with the more-famous Intel 8080 with only two minor instructions added to support its added interrupt and serial input/output features.
Instruction register. In computing, the instruction register (IR) or current instruction register (CIR) is the part of a CPU 's control unit that holds the instruction currently being executed or decoded. [1] In simple processors, each instruction to be executed is loaded into the instruction register, which holds it while it is decoded ...
Instruction cycle. The instruction cycle (also known as the fetch–decode–execute cycle, or simply the fetch–execute cycle) is the cycle that the central processing unit (CPU) follows from boot-up until the computer has shut down in order to process instructions. It is composed of three main stages: the fetch stage, the decode stage, and ...
Contents. x86 instruction listings. The x86 instruction set refers to the set of instructions that x86 -compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor.
Memory-mapped I/O is preferred in IA-32 and x86-64 based architectures because the instructions that perform port-based I/O are limited to one register: EAX, AX, and AL are the only registers that data can be moved into or out of, and either a byte-sized immediate value in the instruction or a value in register DX determines which port is the source or destination port of the transfer.
Instruction 2 would be fetched at t 2 and would be complete at t 6. The first instruction might deposit the incremented number into R5 as its fifth step (register write back) at t 5. But the second instruction might get the number from R5 (to copy to R6) in its second step (instruction decode and register fetch) at time t 3. It seems that the ...
Prefetch input queue. Fetching the instruction opcodes from program memory well in advance is known as prefetching and it is served by using a prefetch input queue (PIQ). The pre-fetched instructions are stored in a queue. The fetching of opcodes well in advance, prior to their need for execution, increases the overall efficiency of the ...
In computing, an opcode[1][2] (abbreviated from operation code, [1] also known as instruction machine code, [3] instruction code, [4] instruction syllable, [5][6][7][8] instruction parcel or opstring[9][2]) is the portion of a machine language instruction that specifies the operation to be performed. Beside the opcode itself, most instructions ...