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UPD703100 Datasheet(PDF) 62 Page - NEC |
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UPD703100 Datasheet(HTML) 62 Page - NEC |
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62 / 185 page  CHAPTER 5 INSTRUCTIONS User’s Manual U12197EJ6V0UM 62 CMP Compare Instruction format (1) CMP reg1, reg2 (2) CMP imm5, reg2 Operation (1) result ← GR [reg2] – GR [reg1] (2) result ← GR [reg2] – sign-extend (imm5) Format (1) Format I (2) Format II Opcode 15 0 (1) rrrrr001111RRRRR 15 0 (2) rrrrr010011iiiii Flag CY 1 if a borrow to MSB occurs; otherwise, 0. OV 1 overflow occurs; otherwise 0. S 1 if the result of the operation is negative; otherwise, 0. Z 1 if the result of the operation is 0; otherwise, 0. SAT – Instruction (1) CMP Compare Register (2) CMP Compare Immediate (5-bit) Explanation (1) Compares the word data of general-purpose register reg2 with the word data of general- purpose register reg1, and indicates the result by using the condition flags. To compare, the contents of general-purpose register reg1 are subtracted from the word data of general-purpose register reg2. The data of general-purpose registers reg1 and reg2 are not affected. (2) Compares the word data of general-purpose register reg2 with 5-bit immediate data, sign- extended to word length, and indicates the result by using the condition flags. To compare, the contents of the sign-extended immediate data are subtracted from the word data of general-purpose register reg2. The data of general-purpose register reg2 is not affected. |
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