Processor flag indicating whether unsigned arithmetic overflow has occurred
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In computer processors the carry flag (usually indicated as the C flag) is a single bit in a system status register/flag register used to indicate when an arithmetic carry or borrow has been generated out of the most significant arithmetic logic unit (ALU) bit position. The carry flag enables numbers larger than a single ALU width to be added/subtracted by carrying (adding) a binary digit from a partial addition/subtraction to the least significant bit position of a more significant word. This is typically programmed by the user of the processor on the assembly or machine code level, but can also happen internally in certain processors, via digital logic or microcode, where some processors have wider registers and arithmetic instructions than (combinatorial, or "physical") ALU.[1] It is also used to extend bit shifts and rotates in a similar manner on many processors (sometimes done via a dedicated flag). For subtractive operations, two (opposite) conventions are employed as most machines set the carry flag on borrow while some machines (such as the 6502 and the PIC) instead reset the carry flag on borrow (and vice versa).
^The well known Z80 and 68000 are examples of such CPUs, among many others.
the carryflag (usually indicated as the C flag) is a single bit in a system status register/flag register used to indicate when an arithmetic carry or...
flags may bypass memory mapping and define what action the CPU should take on arithmetic overflow. The carry, parity, auxiliary carry (or half carry)...
value of the carryflag. A single rotate through carry can simulate a logical or arithmetic shift of one position by setting up the carryflag beforehand...
extra is moved to the left Carryflag, the equivalent in calculation in a computer "Carry" (song), a song by Tori Amos Suzuki Carry, a light commercial vehicle...
register, flag register, or condition code register (CCR) is a collection of status flag bits for a processor. Examples of such registers include FLAGS register...
alter execution based on the current state of a flag. For an instance, after an ADC (Add with Carry) instruction, the BVS (Branch on oVerflow Set) instruction...
A flag carrier is a transport company, such as an airline or shipping company, that, being locally registered in a given sovereign state, enjoys preferential...
flags they would carry into battle. Flag of Knights of the Golden Circle The "Bonnie Blue Flag"—an unofficial flag in 1861 The "Van Dorn battle flag"...
if you need the carryflag). The processor will set the adjust flag if the sum of both lower nibbles is 16 or higher, and the carryflag if the sum of both...
Retrieved 2020-12-30. Allen, Ian D. (25 February 2011). "The CARRYflag and OVERFLOW flag in binary arithmetic". DAT 2343 Computer Systems Architecture...
The national flag of the United States, often referred to as the American flag or the U.S. flag, consists of thirteen equal horizontal stripes of red (top...
bit from a given register to the carryflag. Example: copy the third least significant bit from EAX to the carryflag BT EAX, 2 BTS (Bit Test and Set)...
documentation and assembly languages. Along with a carryflag, a sign flag and an overflow flag, the zero flag is used to check the result of an arithmetic...
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it was common practice during the Revolution for military units to carryflags that featured common American symbols (such as stripes and stars), but...
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copied to the flags register. When this happens, C0 is placed in the carryflag, C2 in the parity flag and C3 in the zero flag. The C2 flag is set when...
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should be flown above the national flag. When the flag is carried with another flag, or flags, it should be carried in the place of honour – that is on...
of Khan Krum carryingflags either in monotone red, or red with a black border. The army of Simeon the Great is also depicted carrying red banners of...
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