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78K Datasheet(PDF) 84 Page - NEC |
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78K Datasheet(HTML) 84 Page - NEC |
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84 / 129 page  84 CHAPTER 5 EXPLANATION OF INSTRUCTIONS User's Manual U12326EJ4V0UM Decimal Adjust Register for Subtraction ADJBS Decimal Adjustment of Subtraction Result [Instruction format] ADJBS [Operation] Decimal Adjust Accumulator for Subtraction [Operand] None [Flag] ZAC CY ××× [Description] • The A register, CY flag and AC flag are decimally adjusted from their contents. This instruction carries out an operation having meaning only when the BCD (binary coded decimal) data is subtracted and the subtraction result is stored in the A register (in all other cases, the instruction carries out an operation having no meaning). See the table below for the adjustment method. • If the adjustment result shows that the A register contents are 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0). Condition Operation AC = 0 CY = 0 A ← A, CY ← 0, AC ← 0 CY = 1 A ← A–01100000B, CY ← 1, AC ← 0 AC = 1 CY = 0 A ← A–00000110B, CY ← 0, AC ← 0 CY = 1 A ← A–01100110B, CY ← 1, AC ← 0 |
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