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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.
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.
Differs from the conventional 8086 HLT instruction in that the clock is stopped too, so that an NMI or CPU reset is needed to resume operation. BRKS imm8: F1 ib: Break and Enable Software Guard. Jump to an address picked from the IVT using the imm8 argument, and then continue execution with "Software Guard" enabled.
The default OperandSize and AddressSize to use for each instruction is given by the D bit of the segment descriptor of the current code segment - D=0 makes both 16-bit, D=1 makes both 32-bit. Additionally, they can be overridden on a per-instruction basis with two new instruction prefixes that were introduced in the 80386: 66h: OperandSize ...
The Motorola 6800 microprocessor was the first for which an undocumented assembly mnemonic HCF became widely known. The operation codes (opcodes—the portions of the machine language instructions that specify an operation to be performed) hexadecimal 9D and DD were reported and given the unofficial mnemonic HCF in a December 1977 article by Gerry Wheeler in BYTE magazine on undocumented ...
For example, the NOP instruction translates to the opcode 0x90, and the HLT instruction translates to 0xF4. [3] There are potential opcodes without documented mnemonics, which different processors may interpret differently. Using such opcodes can cause a program to behave inconsistently or even generate exceptions on some processors.
D1 reading (low level means writing) D2 accessing stack (probably a separate stack memory space was initially planned) D3 doing nothing, has been halted by the HLT instruction; D4 writing data to an output port; D5 reading the first byte of an executable instruction; D6 reading data from an input port; D7 reading data from memory; 4: D5 5: D6 6 ...
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