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In AVR, when is the V flag set?

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in Microcontroller by (14.6k points)
In AVR, when is the V flag set?

(a) there is a carry from D7 bit

(b) there is a carry from D6 to D7 bit

(c) when carry is generated only from D6 to D7 or carry is generated only from D7

(d) none of the mentioned

This question was posed to me in examination.

Origin of the question is Arithmetic and Logic Instructions topic in chapter AVR Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Correct answer is (c) when carry is generated only from D6 to D7 or carry is generated only from D7

For explanation I would say: In AVR, V i.e. Overflow flag is set when carry is generated only from D6 to D7 or carry is generated only from D7. Overflow flag is used to detect errors in signed arithmetic operations.

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