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MSP430x5438 USCI numbers

Steven Crawford
Prodigy 110 points


The data sheet for the 5438 states that there are 4 USCIs, but the are pins for UAC0-3 and UCB0-3, which is 8 in total.  How are these 8 sets of physical pins managed with relation to the stated 4 USCIs?

 

Is it possible to use UCA0 and UCB0 at the same time?

Is it possible to set up UCA0-3 and UCB0-3 all as SPIs,  resulting in 8 spi busses?

  • 0
    TI__Mastermind 24390 points

    Each USCI has two channels, A &B. Channel A supports UART, IrDA, LIN, and SPI while Channel B can support I2C and SPI. Therefore, if a customer is looking for 2 UART channels, the MSP430 should have at least 2 USCI modules. However, if they are looking for two SPI channels, 1 USCI module is enough.

    Each channel can run simultaneously, but care should be taken to ensure the configuration you are looking to use is available on the device pinout (some channel A pins may be multiplexed with channel B pins.

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