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UPD17P133CS Datasheet(PDF) 101 Page - NEC |
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UPD17P133CS Datasheet(HTML) 101 Page - NEC |
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101 / 289 page  CHAPTER 11 ARITHMETIC AND LOGIC UNIT 86 Figure 11-1. Configuration of the ALU Data bus Temporary register A Temporary register B Status flip-flop ALU • Arithmetic operations • Logical operations • Bit evaluations •Comparison evaluations •Rotations Decimal con- version circuit 7EH 7FH Program status word (PSWORD) b0 BCD b3 CMP b2 CY b1 Z b0 IXE Status flip-flop CMP flag FF CY flag FF Z flag FF BCD 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. Address Name Bit Flag |
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