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In the x86 computer architecture, HLT (halt) is an assembly language instruction which halts the central processing unit (CPU) until the next external interrupt is fired. [1] Interrupts are signals sent by hardware devices to the CPU alerting it that an event occurred to which it should react.
Download as PDF; Printable version; ... Pages in category "x86 instructions" The following 53 pages are in this category, out of 53 total. ... HLT (x86 instruction) I ...
The Intel 8086 and subsequent processors in the x86 series have an HLT (halt) instruction, opcode F4, which stops instruction execution and places the processor in a HALT state. An enabled interrupt, a debug exception, the BINIT signal, the INIT signal, or the RESET signal resumes execution, which means the processor can always be restarted. [ 15 ]
The x86 processors support five modes of operation for x86 code, Real Mode, Protected Mode, Long Mode, Virtual 86 Mode, and System Management Mode, in which some instructions are available and others are not. A 16-bit subset of instructions is available on the 16-bit x86 processors, which are the 8086, 8088, 80186, 80188, and 80286.
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. The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new ...
Download as PDF; Printable version; ... HLT may refer to: Computing. HLT (x86 instruction) Human language technology; Places
Many of the 8080's core machine instructions and concepts survive in the widespread x86 platform. Examples include the registers named A , B , C , and D and many of the flags used to control conditional jumps. 8080 assembly code can still be directly translated into x86 instructions, [ vague ] since all of its core elements are still present.
On processors that have a halt instruction that stops the CPU until an interrupt occurs, such as x86's HLT instruction, it may save significant amounts of power and heat if the idle task consists of a loop which repeatedly executes that instruction.