UPD17073 NEC, UPD17073 Datasheet - Page 40
UPD17073
Manufacturer Part Number
UPD17073
Description
4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
Manufacturer
NEC
Datasheet
1.UPD17073.pdf
(226 pages)
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7. ALU (ARITHMETIC LOGIC UNIT) BLOCK
7.1 General
decimal adjuster circuit, and data memory address control circuit.
memory.
40
Figure 7-1 shows the configuration of the ALU block.
As shown in the figure, the ALU block consists of an ALU, temporary registers A and B, program status word,
The ALU performs arithmetic operation, judgment, comparison, rotation, and transfer of 4-bit data on the data
Data memory
Address
control
Temporary
register A
Figure 7-1. Outline of ALU Block
Temporary
register B
Data bus
ALU
• Arithmetic operation
• Logical operation
• Bit judgment
• Comparison
• Rotation
• Transfer
adjuster circuit
Decimal
status word
Program
Carry/borrow/zero
detection/decimal/storage
PD17072,17073
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