From the provided content, which instruction sets the Carry (CY) flag to 1?
Understand the Problem
The question is asking which instruction from the provided options will set the Carry (CY) flag to 1. This involves understanding the behavior of different assembly language instructions related to the CY flag.
Answer
STC instruction
The STC instruction sets the Carry (CY) flag to 1.
Answer for screen readers
The STC instruction sets the Carry (CY) flag to 1.
More Information
The STC instruction, which stands for 'Set the Carry,' is used in microprocessors to explicitly set the Carry flag to 1. This operation is independent of its previous state, meaning it forces the Carry flag to be 1 regardless of its current status.
Tips
A common mistake is confusing the STC instruction with CMC or other logical operations that might affect the Carry flag depending on conditions. Always remember STC explicitly sets the Carry flag to 1.
Sources
- Instructions to complement, set CY flag in 8085 microprocessor - Tutorialspoint - tutorialspoint.com
- Logical Instruction - Collegeek Online Tutorials - collegeek.com
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