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LPC845 microcontroller reset pin

Question asked by Pasquale Barrega on Oct 5, 2018
Latest reply on Oct 19, 2018 by Ian Benton

Good morning, i'm using an LPC845 microcontroller. On the user manual i have read that reset pin has an internal pullup resistor then an external resistor is not necessary if i don't use deep sleep mode.

In my application, the microcontroller run at full power with PLL ON but if i touch reset pin, because the board hasn't any box, i observe an application reset.

Connecting a 10K resistor on the reset pin this phenomenon disappears, then why i observe this behaviour?

The external pullup resistor is mandatory or optional as mentioned by user manual?

The internal pullup is strong or weak?

Thank you in advance.