2. Signed Arithmetic and Overflow
The chapter delves into signed arithmetic and control instructions, particularly focusing on flag behavior in digital design. Key concepts such as overflow, carry, and zero flags are discussed in relation to various arithmetic operations. The chapter outlines important control instructions and provides examples demonstrating the implications of different flag settings in both signed and unsigned arithmetic contexts.
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Sections
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What we have learnt
- Signed arithmetic can yield unexpected results when overflow occurs based on the number of bits allocated.
- Various flags, including zero, carry, and overflow flags, play critical roles in control flow and indicate the results of arithmetic operations.
- Control instructions allow branching based on flag states, influencing program execution.
Key Concepts
- -- Overflow Flag
- This flag indicates when an arithmetic operation produces a result that exceeds the range that can be represented with the available bits.
- -- Carry Flag
- This flag indicates whether a carry has been generated out of the most significant bit during arithmetic operations.
- -- Zero Flag
- This flag indicates whether the result of an operation is zero.
- -- Control Instructions
- Instructions that change the flow of execution based on the status of various flags, enabling conditional and unconditional jumps in the program.
Additional Learning Materials
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