Unused Pins of LPC4322 Microcontroller

[SrinathVelavan]

How do we configure the unused pins on an LPC4322 Microcontroller? At present, I have left them unconnected with no-connect on schematic for my board.

[ZhangJennie · Accepted solution]

Hi

All I/Os default to input with pullup after reset. So it has internal pullup.

For non-opendrain GPIO, left unconnected if driven LOW and configured as GPIO output with pull-up or pull-down disabled by software. Or just default setting (input with pullup) is ok

For opendrain GPIO, left unconnected if driven LOW and configured as GPIO output by software.

Please follow below to configure the unused pins.

Hope this helps,

Jun Zhang

[SrinathVelavan]

Thank you for your answer.