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.