i used P0.08 and P0.06 as one UART. i need to use another uart...can anyone tell me what pins other than this i can use..BTW nrf52840
As you can read in nRF52840 (preliminary) Product Specification you can use pretty much any GPIO PIN for UART. Just make sure that your particular board (where nRF52 chip is mounted) doesn't have other components attached to that PIN (e.g. pull-ups for I2C, LEDs, buttons, NFC antenna tuning etc.)