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DAS (SPC700): Difference between revisions

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!colspan="8"|Flags Clobbered
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Revision as of 02:08, 26 November 2023

Basic Info
Addressing Mode Opcode Length Speed
Accumulator BE 1 byte 3 cycles
Flags Affected
N V P B H I Z C
. . . . .

DAS (Decimal Adjust for Subtraction) is an SPC700 instruction that performs the following:

  1. If either the carry flag is clear or the accumulator exceeds 0x99, 0x60 is subtracted from the accumulator and the carry flag is cleared.
  2. Then, if either the half-carry flag is clear or the low nibble of the accumulator exceeds 0x09, 0x06 is subtracted from the accumulator

See Also

External Links