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UPD17P136ACT Datasheet(PDF) 103 Page - NEC |
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UPD17P136ACT Datasheet(HTML) 103 Page - NEC |
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103 / 292 page  CHAPTER 11 ARITHMETIC AND LOGIC UNIT (ALU) 84 Figure 11-1. ALU Configuration Data bus Temporary register A Temporary register B Status flip-flop ALU • Arithmetic operations • Logical operations • Bit judgement • Comparison judgement • Rotations Decimal correction circuit 7EH b0 BCD b3 b2 b1 b0 CMP CY Z IXE 7FH Program status word (PSWORD) Address Name Bit Flag Status flip-flop BCD flag FF CMP flag FF CY flag FF Z flag FF Function outline Indicates when the result of an arithmetic operation is 0. Stores the borrow or carry from an arithmetic operation. Used to indicate whether to store the result of an arithmetic operation. Used to indicate whether to perform decimal correction for arithmetic operations. |
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