unused pins , output-mode disable pull-down?

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unused pins , output-mode disable pull-down?

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jun1
Contributor V

Hello.
In the LPC82X data sheet, it is recommended to disable unused pins and output LOW in the output mode, but is it also possible to disable pull-down?
The MODE bit in the IOCON register is
0x0 Inactive (no pull-down / pull-up resistor enabled).
0x1 Pull-down resistor enabled.
0x2 Pull-up resistor enabled.
0x3 Repeater
So, which one is recommended, 0x0 or 0x01?
Sorry, I do not have much knowledge of hardware.

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ZhangJennie
NXP TechSupport
NXP TechSupport

Hi Jun

Make the unused pin as floating, and then set it as output low in software. GPIO output with pull-up disabled, and pull-down enabled.


Have a great day,
Jun Zhang

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ZhangJennie
NXP TechSupport
NXP TechSupport

Hi Jun

Make the unused pin as floating, and then set it as output low in software. GPIO output with pull-up disabled, and pull-down enabled.


Have a great day,
Jun Zhang

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

View solution in original post

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jun1
Contributor V

Thank you for a polite answer.
I understand that.


Have a nice day!

jun

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ZhangJennie
NXP TechSupport
NXP TechSupport

You are welcome!

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