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Does a pull-up resistor need to be connected externally to each unused pin?

Last Updated:12/26/2017

Question:

Does a pull-up resistor need to be connected externally to each unused pin?

Answer:

No, a pull-up resistor does not need to be connected externally to each unused pin.
Please treat unused pins in accordance with "Processing of unused pins" in "User's Manual Hardware".

When an internal pull-up resistor is used, the initial value of the pull-up control register is set to 00h after a reset.
Note that this causes the pull-up resistor to be disabled and the direction register to be left open for input until the pull-up control register is set after a reset.
Suitable Products
R8C/18
R8C/19
R8C/1A
R8C/1B
R8C/20
R8C/21
R8C/22
R8C/23
R8C/24
R8C/25
R8C/26
R8C/27
R8C/28
R8C/29
R8C/2A
R8C/2B
R8C/2C
R8C/2D
R8C/2E
R8C/2F
R8C/2G
R8C/2H
R8C/2J
R8C/2K
R8C/2L
R8C/32C
R8C/33C
R8C/34C
R8C/35C
R8C/36C
R8C/38C
R8C/3GC
R8C/3JC
R8C/32D
R8C/33D
R8C/35D
R8C/3GD
R8C/33T
R8C/38A
R8C/34E, R8C/34F, R8C/34G, R8C/34H
R8C/36E, R8C/36F, R8C/36G, R8C/36H
R8C/38E, R8C/38F, R8C/38G, R8C/38H
R8C/L35C
R8C/L36C
R8C/L38C
R8C/L3AC
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