topic LPC54608 pins pull up on reset in LPC Microcontrollers

LPC54608 pins pull up on reset

F_Vaquero — Tue, 08 Sep 2020 06:58:07 GMT

Most of the pins of the LPC54608 are with pull up on reset state. May I change this behaviour? I've seen that other microcontrollers have a non volatile memory (FAIM) to set up whether we want pull up, pull down or high-z at pins on reset.

Re: LPC54608 pins pull up on reset

frank_m — Tue, 08 Sep 2020 13:13:04 GMT

I think not.

Check MCU user manual (UM10912.pdf), all peripheral register description sections describe a fixed reset value.

Re: LPC54608 pins pull up on reset

Alice_Yang — Wed, 09 Sep 2020 02:58:46 GMT

Hello F_Vaquero,

No, pins will be the reset states as Data sheet -> Table 4 Pin description.

Re: LPC54608 pins pull up on reset

F_Vaquero — Thu, 10 Sep 2020 16:59:12 GMT

Thank you for your confirmation. Do you know why most of the pins are pull-up? This complicates a bit hardware design and for many years the "standard" reset state of pins has been high-Z.