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# N [[Negative flag]]. Set to a copy of the most significant bit of an arithmetic result.
# V [[Overflow flag]]. Set in case of two's complement overflow.
# S Sign flag. Unique to AVR, this is always
# H [[Half-carry flag]]. This is an internal carry from additions and is used to support [[Binary-coded decimal|BCD]] arithmetic.
# T Bit copy. Special bit load and bit store instructions use this bit.
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