Do Kinetis K22 has internal pullups on the SDHC peripheral lines?

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Do Kinetis K22 has internal pullups on the SDHC peripheral lines?

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pasqualelongo
Contributor I

Or i need to put them external?
Thanks,

Pasquale

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pasqualelongo
Contributor I

Thanks Mark and Paul,

I'll perform some tests using internal pullups, if i'll found problems i'll install external.

Will keep you updated

Pasquale

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mjbcswitzerland
Specialist V

Pasquale

You can decide whether pull-ups are enabled or not when configuring each pin. See PORTn_PCRx register.

The pull-up resistors will have a wider tolerance spread than external ones though.

Regards

Mark

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Paul_Tian
NXP Employee
NXP Employee

Hi, Longo

I agree with Mark. It is better to add external pull-up resistor. The internal resistor is a weak pull-up. So you need add a strong pull-up external to ensure communication is good on no good layout condition. Hope my reply can help you.

Best Regards

Paul

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