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78K Datasheet(PDF) 71 Page - NEC |
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78K Datasheet(HTML) 71 Page - NEC |
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71 / 129 page  71 CHAPTER 5 EXPLANATION OF INSTRUCTIONS User's Manual U12326EJ4V0UM Increment INC Byte Data Increment [Instruction format] INC dst [Operation] dst ← dst + 1 [Operand] Mnemonic Operand(dst) INC r saddr [Flag] ZAC CY ×× [Description] • The destination operand (dst) contents are incremented by only one. • If the increment result is 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0). • If the increment generates a carry for bit 4 out of bit 3, the AC flag is set (1). In all other cases, the AC flag is cleared (0). • Because this instruction is frequently used for increment of a counter for repeated operations and an indexed addressing offset register, the CY flag contents are not changed (to hold the CY flag contents in multiple- byte operation). [Description example] INC B; The B register is incremented. |
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