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Starterware/MSP430F67471A: Configuration of PxDIR when pin works as UART

Part Number: MSP430F67471A

Tool/software: Starterware


I have a question.

In the example code "msp430f677xA_uscia0_uart_03.c", it is described following code.

P3SEL0 |= BIT0 | BIT1; // Set P3.0, P3.1 to non-IO
P3DIR |= BIT0 | BIT1; // Enable UCA0RXD, UCA0TXD

Device datasheet saids , P3DIR don't care when P3SEL is set,.

why does the sample code configure P3DIR register?



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