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CHAPTER 6 DETAILED RULES FOR EXECUTION INSTRUCTIONS
6.27 DAS (Decimal Adjust for Subtraction)
Subtract the correction value from AL according to the state of the C or H-flag before
executing instruction.
■ DAS (Decimal Adjust for Subtraction)
Operation
(AL)
← (AL) - 6 or 60H or 66H
(Subtract a correction value shown in the next page to AL and the value of AL according to the state of
the C or H-flag.)
Assembler format
DAS
Condition code (CCR)
+: Changed by executing instruction
-: Not changed
N: Set to 1 if the MSB is 1 as the result of operation and set to 0 in other cases.
Z: Set to 1 if the result of operation is 00
H
and set to 0 in other cases.
V: Set to 1 if an overflow occurs as the result of operation and set to 0 in other cases.
C: Change as indicated on the next page.
Number of execution cycle: 1
Byte count: 1
OP code: 94
NZVC
++++