# status register

> register containing flags giving additional information concerning a result in a processor

**Wikidata**: [Q1322850](https://www.wikidata.org/wiki/Q1322850)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Status_register)  
**Source**: https://4ort.xyz/entity/status-register

## Summary  
A status register is a processor register that contains flags providing additional information about the result of an operation in a digital processor. It is immediately accessible working storage used to indicate conditions like overflow, carry, or zero results. Commonly referred to as a flag register or condition code register, it plays a critical role in processor control flow.

## Key Facts  
- **Type**: Subclass of processor register, part of the execution unit.  
- **Aliases**: Flag register, condition code register (CCR), Processor Status Word, Programmstatuswort.  
- **Short Name**: CCR (Condition Code Register).  
- **Related Entities**: FLAGS register (x86 architecture), Adjust flag, Program Status Word (IBM System/360).  
- **Wikidata Description**: Register containing flags giving additional information about a processor result.  
- **Sitelink Count**: 14 (Wikipedia coverage in 10 languages).  
- **Technical IDs**: BabelNet ID (`03428885n`), Freebase ID (`/m/02v59q`), ScienceDirect topics (`computer-science/status-register`, `engineering/status-register`).  

## FAQs  
### Q: What is the purpose of a status register?  
A: It stores flags (binary indicators) that provide feedback about the outcome of processor operations, such as whether a result was zero, negative, or caused an overflow.  

### Q: Is the FLAGS register the same as a status register?  
A: Yes, the FLAGS register is a specific implementation of a status register in x86 architecture, tracking conditions like carry, parity, and zero.  

### Q: What are common flags in a status register?  
A: Common flags include carry (C), zero (Z), overflow (V), and negative (N), though exact flags vary by architecture.  

## Why It Matters  
The status register is fundamental to processor operation, enabling conditional branching and error detection. By storing flags like carry or overflow, it allows programs to react dynamically to arithmetic or logical results, forming the basis of control flow in computing. Its role is critical in low-level programming, embedded systems, and performance optimization, as it directly influences how processors handle decisions and exceptions. Without status registers, modern computing would lack efficient error handling and branching logic.  

## Notable For  
- **Ubiquity**: Found in nearly all processor architectures, often under different names (e.g., FLAGS in x86, PSW in IBM systems).  
- **Critical Function**: Enables conditional jumps and error handling by storing operation outcomes.  
- **Varied Implementations**: Flags differ across architectures but universally serve to monitor processor state.  

## Body  
### Definition and Function  
- A status register is a small, fast-access storage location within a processor’s execution unit.  
- It contains binary flags (bits) that reflect the outcome of operations (e.g., zero, carry, overflow).  

### Technical Specifications  
- **Subclass Of**: Processor register (immediate working storage in digital processors).  
- **Aliases**: Includes "flag register," "CCR," and language-specific terms like "registro de banderas" (Spanish) or "ステータス・レジスタ" (Japanese).  

### Related Architectures  
- **FLAGS Register**: x86-specific status register with flags like CF (Carry Flag) and ZF (Zero Flag).  
- **Program Status Word (PSW)**: IBM System/360’s control register combining status and control bits.  

### External References  
- **ScienceDirect Topics**: Covers applications in computer science and engineering.  
- **Wikidata**: Provides multilingual descriptions and links to Wikipedia articles in 10 languages.

## References

1. BabelNet