http://learn.cemetech.net/index.php?action=history&feed=atom&title=Z80%3AOpcodes%3ADAAZ80:Opcodes:DAA - Revision history2026-06-02T04:44:51ZRevision history for this page on the wikiMediaWiki 1.43.3http://learn.cemetech.net/index.php?title=Z80:Opcodes:DAA&diff=295&oldid=prevMaintenance script: Initial automated import2016-02-05T22:22:21Z<p>Initial automated import</p>
<p><b>New page</b></p><div><!-- Short summary of instruction --><br />
When this instruction is executed, the A register is BCD corrected using the contents of the flags. The exact process is the following: if the least significant four bits of A contain a non-BCD digit (i. e. it is greater than 9) or the H flag is set, then $06 is added to the register. Then the four most significant bits are checked. If this more significant digit also happens to be greater than 9 or the C flag is set, then $60 is added.<br />
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== Syntax ==<br />
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<!-- Syntax for this instruction --><br />
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daa<br />
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== Effects ==<br />
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<!-- What the instruction does to flags --><br />
If the second addition was needed, the C flag is set after execution, otherwise it is reset. The N flag is preserved, P/V is parity and the others are altered by definition.<br />
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== Uses ==<br />
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<!-- What the instruction can be used for --><br />
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== T-States ==<br />
4 t-states<br />
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== See Also ==<br />
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<!-- Other instructions that are related to this one --><br />
[[Z80:Opcodes:ADC|ADC]],[[Z80:Opcodes:ADD|ADD]],[[Z80:Opcodes:DEC|DEC]],[[Z80:Opcodes:INC|INC]],[[Z80:Opcodes:SBC|SBC]],[[Z80:Opcodes:SUB|SUB]]<br />
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{{lowercase}}<br />
[[Category:Z80 Assembly]]<br />
[[Category:Z80 Heaven]]<br />
[[Category:Z80 Opcodes]]</div>Maintenance script