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UPD703100 Datasheet(PDF) 70 Page - NEC |
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UPD703100 Datasheet(HTML) 70 Page - NEC |
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70 / 185 page  CHAPTER 5 INSTRUCTIONS User’s Manual U12197EJ6V0UM 70 DIVHU Divide Half-word Unsigned Instruction format DIVHU reg1, reg2, reg3 Operation GR [reg2] ← GR [reg2] ÷ GR [reg1] GR [reg3] ← GR [reg2] % GR [reg1] Format Format XI Opcode 15 0 31 16 rrrrr111111RRRRR wwwww01010000010 Flag CY – OV 1 if overflow occurs; otherwise, 0. S 1 if the result of an operation is negative; otherwise, 0. Z 1 if the result of an operation is 0; otherwise, 0. SAT – Instruction DIVH Divide Half-word Unsigned Explanation Divides the word data of general-purpose register reg2 by the lower halfword data of general- purpose register reg1, and stores the quotient in general-purpose register reg2, and the remainder in general-purpose register reg3. If the data is divided by 0, an overflow occurs, and the quotient is undefined. The data of general-purpose register reg1 is not affected. Remark An overflow occurs when data is divided by 0 (in which case the quotient is undefined). If an interrupt occurs while this instruction is being executed, division is aborted, and the interrupt is processed. Upon returning from the interrupt, the division is restarted from the beginning, with the return address being the address of this instruction. Also, general-purpose registers reg1 and reg2 will retain their original values prior to the start of execution. If the address of reg2 is the same as the address of reg3, the remainder is stored in reg2 (=reg3). |
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