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When adding two 16-bit values using two 8-bit additions, why is ADD used for the...

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When adding two 16-bit values using two 8-bit additions, why is ADD used for the low byte and ADDC used for the high byte?

Because ADD automatically clears the carry flag

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Because ADD is faster than ADDC

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Because the high-byte addition must include the carry generated by the low-byte addition

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Because ADDC is only valid for signed arithmetic

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