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Assembler User Guide: Updates to the condition flags - Keil

Instructions with the optional S suffix update the flags. ... N. Set to 1 when the result of the operation is negative, cleared to 0 otherwise.

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查詢 「N flag」的人也找了：

  1. N flag
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  2. Direction flag
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  4. n flag assembly
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  5. Parity flag
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  6. C flag
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  7. Trap flag
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  8. Sign flag assembly
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