PD17012_15 Datasheet, PDF (56/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
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, a program status
word, decimal adjuster, and data memory address controller.
The ALU operates, judges, compares, rotates, and transfers 4-bit data in the data memory.
Figure 7-1. Outline of ALU Block
Data bus
Address
control
Temporary Temporary
register A register B
Index modification
memory pointer
Data memory
Program status word
Carry/borrow/
zero detection/decimal/
storage specification
ALU
• Arithmetic operation
• Logical operation
• Bit judgment
• Comparison
• Rotation processing
• Transfer
Decimal adjustment
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Data Sheet U10101EJ4V0DS