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DAA (SPC700)

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Revision as of 22:22, 4 August 2024 by Xetheria (talk | contribs) (correcta BCD sum)
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Basic Info
Addressing Mode Opcode Length Speed
Accumulator DF 1 byte 3 cycles
Flags Affected
N V P B H I Z C
N . . . . . Z C

DAA (Decimal Adjust for Addition) is an SPC700 instruction that corrects a BCD sum:

  1. If either the carry flag is set or the accumulator exceeds 0x99, add 0x60 to the accumulator and set the carry flag.
  2. Then, if either the half-carry flag is set, or the lower nibble of the accumulator exceeds 0x09, add 0x06 to the accumulator.

The SPC700 has no decimal mode.

Syntax

DAA
DAA A

See Also

External Links