Hi Ali, Regarding my first question, is this behavior repeatable for the ME1 register of a USART0 example? URXIE1, GIE, and URXIFG1 must all be set for the USART to service an RX interrupt, another interrupt condition of higher priority that occurs at the same time or an ISR that is currently being serviced will prevent the USART ISR from immediately being accessed. Regards, Ryan
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