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External RTC bq32000

Aseem Gupta
Intellectual 305 points
Other Parts Discussed in Thread: MSP430F169, BQ32000

I want to use External RTC as I can have a backup battery for time for day of year application. I am also using an LCD on pins 28, 29, 30, 31 of MSP430F169 Microcontroller. Need help in interfacing the RTC also

 

 

  • 0
    TI__Guru 64510 points

    The BQ32000 uses an I2C interface.  On the MSP430F169, the USART which supports I2C is available on P3.1/SDA and P3.3/SCL which are pins 29 and 31 respectfully.  Unfortunately, you state these are already consumed by your LCD, presumably with the SPI interface.

    Therefore, you will need to implement an I2C master interface using General Purpose I/O bit-banging methods.  At this point, you can use whatever pins you want that support a Port I/O.

    EDIT : Or is there any chance you could connect the LCD SPI interface on USART1 which supports SPI, and have USART0 implement I2C?

  • 0 in reply to BrandonAzbell
    Intellectual 305 points

    Can You please give me an LCD model which i can connect to USART1 Pins 34,35 and how?

  • 0 in reply to Aseem Gupta
    TI__Guru 64510 points

    I'm not sure I understand what you are asking.

    On the MSP430F169, the USART1 (SPI mode) is on pins 44, 45, 46 and 47.

    This is indicated in the MSP430F169 datasheet in the pin designation figure on page 3 and in the Terminal Functions table on page 7 and 8.

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