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78K Datasheet(PDF) 81 Page - NEC |
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78K Datasheet(HTML) 81 Page - NEC |
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81 / 129 page  81 CHAPTER 5 EXPLANATION OF INSTRUCTIONS User's Manual U12326EJ4V0UM Rotate Left Digit ROL4 Digit Rotation to the Left [Instruction format] ROL4 dst [Operation] A3-0 ← (dst)7-4, (dst)3-0 ← A3-0, (dst)7-4 ← (dst)3-0 [Operand] Mnemonic Operand(dst) ROL4 [HL] Note Note Specify an area other than the SFR area as operand [HL]. [Flag] ZAC CY [Description] • The lower 4 bits of the A register and the 2-digit data (4-bit data) of the destination operand (dst) are rotated to the left. The higher 4 bits of the A register remain unchanged. A (HL) 74 30 74 30 Before Execution 0001 0010 0100 1000 After Execution 0001 0100 1000 0010 0 0 3 4 7 dst 3 4 7 A [Description example] ROL4 [HL]; Leftward digit rotation is executed with the memory contents specified by the A and HL registers. |
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