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The CPU power states C0–C3 are defined as follows: C0 is the operating state. C1 (often known as Halt) is a state where the processor is not executing instructions, but can return to an executing state essentially instantaneously. All ACPI-conformant processors must support this power state.
A control register is a processor register that changes or controls the general behavior of a CPU or other digital device. Common tasks performed by control registers include interrupt control, switching the addressing mode , paging control, and coprocessor control.
In 1973, ECMA-35 and ISO 2022 [18] attempted to define a method so an 8-bit "extended ASCII" code could be converted to a corresponding 7-bit code, and vice versa. [19] In a 7-bit environment, the Shift Out would change the meaning of the 96 bytes 0x20 through 0x7F [a] [21] (i.e. all but the C0 control codes), to be the characters that an 8-bit environment would print if it used the same code ...
C0 or C00 has several uses including: C0, the IATA code for Centralwings airline; C0 and C1 control codes; a CPU power state in the Advanced Configuration and Power Interface; an alternate name for crt0, a library used in the startup of a C program; in mathematics: the differentiability class C 0; a C 0-semigroup, a strongly continuous one ...
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Move from general register to control register. [k] Moves to the CR3 control register are serializing and will flush the TLB. [l] On Pentium and later processors, moves to the CR0 and CR4 control registers are also serializing. [m] MOV reg,DRx: 0F 21 /r [j] Move from x86 debug register to general register. [k] MOV DRx,reg: 0F 23 /r [j]
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