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78098 Datasheet(PDF) 72 Page - NEC |
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78098 Datasheet(HTML) 72 Page - NEC |
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72 / 129 page  72 CHAPTER 5 EXPLANATION OF INSTRUCTIONS User's Manual U12326EJ4V0UM Decrement DEC Byte Data Decrement [Instruction format] DEC dst [Operation] dst ← dst – 1 [Operand] Mnemonic Operand(dst) DEC r saddr [Flag] ZAC CY ×× [Description] • The destination operand (dst) contents are decremented by only one. • If the decrement result is 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0). • If the decrement generates a carry for bit 3 out of bit 4, the AC flag is set (1). In all other cases, the AC flag is cleared (0). • Because this instruction is frequently used for decrement 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). • If dst is the B or C register or saddr, and it is not desired to change the AC and CY flag contents, the DBNZ instruction can be used. [Description example] DEC FE92H; The contents at address FE92H are decremented. |
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