Hi,
on my LPC11C24 I need to upgrade the firmware but when the micro restarts, all the GPIOs go high cause of the internal pull-up resistors . I'm wondering if it's possible to change the reset state of those pins before adding some external pull-down resistor to solve the problem.
Thank you for your help in this matter.
Davide Salvetti
Solved! Go to Solution.
Hi Davide,
From startup of the supply (0v) till about 1.8v the MCU is in an undefined state, above 1.8v the I/O pins will be in the default configuration which is input with pull-up enabled. The default state can’t be controlled trough software, but you could add a stronger external pull down to override that state.
Hope it helps!
Best Regards,
Carlos Mendoza
Technical Support Engineer
Hi Davide,
From startup of the supply (0v) till about 1.8v the MCU is in an undefined state, above 1.8v the I/O pins will be in the default configuration which is input with pull-up enabled. The default state can’t be controlled trough software, but you could add a stronger external pull down to override that state.
Hope it helps!
Best Regards,
Carlos Mendoza
Technical Support Engineer