Hi Sanath, Your P1SEL1 setting is not correct, P1SEL1 control bits should be 0 for UART function selected. you can refer to MSP430FR2633 datasheet Table 6-17. And if you are using the project generated by CDC, there is interface setting for UART and I2C in BSP_configureMCU(void) in CAPT_BSP.c. Regards KC
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