Carry Flag

Concept

The Carry Flag is a single-bit status flag in the Flag Register used to indicate when an arithmetic operation produces a result that exceeds the capacity of the destination register (an unsigned overflow), and to propagate a carry into or out of multi-byte or multi-nibble arithmetic operations.

First seen 6/20/2026

Last seen 6/20/2026

Evidence 1 chunks

Wiki v1

WIKI

Definition

The Carry Flag is a status flag, typically occupying bit 0 (F(0)) of a processor's Flag Register, that indicates whether an unsigned arithmetic operation produced a result too large to fit in the destination register. When set, it signals that an overflow has occurred, allowing subsequent instructions to handle extended-precision arithmetic by incorporating the carry bit.

Role in Arithmetic Operations

READ FULL ARTICLE →

NEIGHBORHOOD

No graph connections found for this entity yet. It may appear in future ingestion runs.

explore full graph →

RELATIONSHIPS

1 connections

Flag Register part of → 97% 1e

The Carry Flag is bit-index 0 of the flag register F.

LINKED ENTITIES

1 links

Flag Register PART_OF Extracted graph relationship

CITATIONS

3 sources

3 citations — click to collapse

[1] The Carry Flag (F(0)) is set only if an overflow occurs during an arithmetic operation. KU Leuven Diepenbeek Course Material on Digital Design and Verification

[2] A carry from the lower nibble to the higher nibble (such as a transition from 0x0F to 0x14) is reflected in register F at bit-index 1, which corresponds to the Half Carry flag. KU Leuven Diepenbeek Course Material on Digital Design and Verification

[3] When implementing an ADD H instruction, the Carry flag F(0) is only set if an overflow occurs, while the Half Carry flag F(1) is only set if a carry occurred from the lower to higher nibble. KU Leuven Diepenbeek Course Material on Digital Design and Verification