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MSP430FR2355: MSP low-power microcontroller forum

da
Expert 2780 points
Part Number: MSP430FR2355
Other Parts Discussed in Thread: MSP-EXP430FR2355

Hello,

Q1
When using eUSCI in SPI master mode and Not ready, what is the state of the SIMO pin?

Q2
Is it the same state if it is MSP430 eUSCI?

In the data sheet description, the signal of SIMO is at the center, so it is Hi-z.

But,

The signal does not go low even if SIMO is pulled down on the evaluation board (MSP-EXP430FR2355).
SIMO has no other connection. It pulls down with 1.5kΩ.

(The polarity of the STE of msp430fr235x_euscia0_spi_11.c is being changed.)

Is the STE different from the not ready state than the not ready state? .

Regard,
Da

  • 0
    TI__Mastermind 39895 points

    Hi,

    Q1: The state of SIMO is not stable when it doesn't transmit data. Here is my test result. From the result, you can see that the state of SIMO before will not affect the sending data, because SPI of MSP430 is designed to be that data is changed on the first UCLK edge and captured on the following edge or data is captured on the first UCLK edge and changed on the following edge.

    Send 0x01:

    Send 0x00:

    Send 0x80:

    Q2: The SPI is digital signal, it is 0 or 1 and can't be 0.5. You need to take this as a reference.

    Eason

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