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

Keirs

Expert 2605 points

Part Number: MSP430F67471A

Tool/software: Starterware

Hello.

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?

Regards,

uchida-k

over 7 years ago

0 Lalindra Jayatilleke over 7 years ago

TI__Mastermind 30365 points

Moving this thread to the MSP430 forum. Thanks for your patience.

0 Ryan Brown1 over 7 years ago

TI__Guru**** 202256 points

Hi uchida-k,

There is no specific reason for this line of code and it can be removed harmlessly. It is most likely a remaining copy-and-paste fragment from another code example.

Regards,
Ryan

0 Keirs over 7 years ago in reply to Ryan Brown1

Expert 2605 points

Hi Ryan,

I understand.
Thank you.

Regards,

uchida-k

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