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Encyclopedia > Status register

A status register (also: flag register or condition code register (CCR)) is a collection of flag bits for a processor that indicates own unique FLAGS register. In computer programming, flag refers to one or more bits that are used to store a binary value or code that has an assigned meaning. ... This article is about the unit of information. ... CPU redirects here. ... The FLAGS register is a special register in Intel x86 microprocessors that contains the current state of the processor. ...


Common status register flags

  • Z = Zero flag. Indicates whether the result of a mathematical or logical operation was zero
  • C = Carry flag. Indicates ]] of Toshiba microcontrollers, the N flag and S flag have different meanings: the S flag indicates whether a subtraction or addition has taken place, whereas the N flag indicates whether the last operation result is positive or negative (see PDF page 10 of the official operation manual).
  • V (sometimes O or W) = Overflow flag. Indicates whether the result of an operation has overflowed according to the two's complement representation. (Similar to the carry flag but for signed operations)
  • I = Interrupt enable flag. Interrupts can be enabled or disabled by respectively setting or clearing this flag
  • P = Parity flag. Indicate whether the number of bits of the result is odd or even

In computer processors carry flag is a single bit in a system status (flag) register used to indicate when an arithmetic carry or borrow has been generated out of the most significant ALU bit position. ... Toshiba Corporations headquarters (Center) in Hamamatsucho, Tokyo Toshiba Corporation sales by division for year ending March 31, 2005 Toshiba Corporation ) (TYO: 6502 ) is a Japanese multinational conglomerate manufacturing company, headquartered in Tokyo, Japan. ... It has been suggested that this article or section be merged with embedded microprocessor. ... In computer processors, the overflow flag is usually a single bit in a system status register used to indicate when an arithmetic overflow has occurred in an operation. ... The twos complement of a binary number is the value obtained by subtracting the number from a large power of two (specifically, from 2N for an N-bit twos complement). ... In computer engineering, an interrupt is a signal from a device which typically results in a context switch: that is, the processor sets aside what its doing and does something else. ... In computer processors the parity flag indicates if the number of set bits is odd or even in the binary representation of the result of the last operation. ...

See also


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