MSP430FR5994: SPI pins

Gaosheng Liu

Prodigy 210 points

Part Number: MSP430FR5994

Hi,

I want to know the specific pins on msp430fr5994 corresponding to SPI pins(CS pin, SCLK pin, MOSI pin, MISO pin)?

Best,

Gaosheng

over 4 years ago

0 James Evans over 4 years ago

TI__Mastermind 49692 points

Hello,

You can also find these details in the datasheet. Do you know where to find it?

0 Gaosheng Liu over 4 years ago in reply to James Evans

Prodigy 210 points

I find the datasheet actually before asking the question. But can you tell me which pins, because the pins in the datasheet are not so clear.

Best,

Gaosheng

0 James Evans over 4 years ago in reply to Gaosheng Liu

TI__Mastermind 49692 points

I find it helpful to search the datasheet (Ctrl + f) for these types of terms (e.g. SCLK, MOSI, MISO). If you do that, you'll find the SPI pins. They may be shared with other functions, but the datasheet includes details on how to configure/select specific functions for each pin.

0 Gaosheng Liu over 4 years ago in reply to James Evans

Prodigy 210 points

Not find. You can try.

0 Keith Barkley over 4 years ago

Guru 42145 points

CS is just a GPIO that you choose, it is not specific to the EUSCI.

0 Gaosheng Liu over 4 years ago in reply to Keith Barkley

Prodigy 210 points

Thank you! The last question is what's the difference between General-purpose digital I/O with port interrupt and wake up from LPMx.5 and General-purpose digital I/O?

0 Keith Barkley over 4 years ago in reply to Gaosheng Liu

Guru 42145 points

A GPIO with interrupt will allow an interrupt handler to be run - even if the 5994 is sleeping - when the GPIO transitions state.

For your CS, GPIO without the interrupt is fine.

However, in your case, you might want to use a GPIO *with* interrupt to allow your BLE interface to signal the MCU that it has a message available, even if the MCU is sleeping. This way you do not need to continually poll the BLE interface from the MCU.

+1 James Evans over 4 years ago in reply to Gaosheng Liu

TI__Mastermind 49692 points

Gaosheng Liu said:
Not find. You can try.

You're right. The terms are actually SIMO and SOMI.

0 Gaosheng Liu over 4 years ago in reply to Keith Barkley

Prodigy 210 points

What's the meaning of the UCA0STE pin? Should it connect to the slave device?

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MSP430FR5994: SPI pins