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UPD17708 Folha de dados(PDF) 60 Page - Renesas Technology Corp

Nome de Peças UPD17708
Descrição Electrónicos  MOS INTEGRATED CIRCUIT
PDF  358 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
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UPD17708 Folha de dados(HTML) 60 Page - Renesas Technology Corp

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µPD17704, 17705, 17707, 17708, 17709
58
7. ALU (Arithmetic Logic Unit) BLOCK
7.1 Outline of ALU Block
Figure 7-1 outlines the ALU block.
As shown in the figure, the ALU block consists of an ALU, temporary registers A and B, program status word,
decimal adjustment circuit, and memory address control circuit.
The ALU operates on, judges, compares, rotates, and transfers 4-bit data in the data memory.
Figure 7-1. Outline of ALU Block
Data bus
Address
control
Data memory
Index modification
memory pointer
Temporary
register A
Temporary
register B
Program status word
Carry/borrow/zero
detection/decimal/storage
specification
ALU
• Arithmetic operation
• Logical operation
• Bit judgment
• Comparison
• Rotation
• Transfer
Decimal adjustment



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