Difference between revisions of "Z80:Opcodes:DAA"
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Latest revision as of 22:22, 5 February 2016
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.
Contents
Syntax
daa
Effects
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.
Uses
T-States
4 t-states
See Also
