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UPD703101A Datasheet(PDF) 51 Page - NEC |
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UPD703101A Datasheet(HTML) 51 Page - NEC |
51 / 185 page CHAPTER 5 INSTRUCTIONS User’s Manual U12197EJ6V0UM 51 ADD Add Instruction format (1) ADD reg1, reg2 (2) ADD imm5, reg2 Operation (1) GR [reg2] ← GR [reg2] + GR [reg1] (2) GR [reg2] ← GR [reg2] + sign-extend (imm5) Format (1) Format I (2) Format II Opcode 15 0 (1) rrrrr001110RRRRR 15 0 (2) rrrrr010010iiiii Flag CY 1 if a carry occurs from MSB; otherwise, 0. 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 (1) ADD Add Register (2) ADD Add Immediate (5-bit) Explanation (1) Adds the word data of general-purpose register reg1 to the word data of general-purpose register reg2, and stores the result in general-purpose register reg2. The data of general- purpose register reg1 is not affected. (2) Adds 5-bit immediate data, sign-extended to word length, to the word data of general- purpose register reg2, and stores the result in general-purpose register reg2. |
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