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关于MSP430F5529的USCI问题

WenWen NI
Prodigy 20 points
Other Parts Discussed in Thread: MSP430F5529

设计中使用了MSP430F5529的USCI功能，其中

USCI_A1    -----------    UART

USCI_B1    -----------    IIC

调试的时候发现这个两个不能同时使用，因此查看手册有以下说明：

这是不是说明该芯片的USCI_A1和USCI_B1不能同时中断使用！！如果可以，应如何设置，谢谢！！

  • 0
    Guru 67475 points

    可以同时使用的.

    34.3.15这两句话,第一句是针对只有USCI模块的msp430说的,第二句是对同时有USCI_Ax和USCI_Bx模块的单片机说的

  • 0
    Expert 1415 points

    MSP430x5xx and MSP430x6xx Family User's Guide

    Literature Number: SLAU208N June 2008–Revised May 2014 (ditto)

     

    34.3.15 USCI Interrupts

    The USCI has only one interrupt vector that is shared for transmission and for reception. USCI_Ax and USC_Bx do not share the same interrupt vector.

     

    35.3.8 SPI Interrupts

    (Ditto)

     

    36.3.7 USCI Interrupts in I2C Mode

    (Ditto)

     

    I think “USC_Bx” is a typo and the repeating paragraph meant:

    “Each USCI_Ax and each USCI_Bx has only one interrupt vector that is shared for transmission and for reception.”

  • 0
    Intellectual 461 points

    你理解错了。这段话要分开看，有两层意思：

    1. 每个USCI只有一个中断向量，发送和接收共用一个中断向量。

    2. 5529有两个USCI：USCI_Ax和USC_Bx，它们分别使用不同的中断向量

    其实你去看5529的中断向量表就知道了，USCI_A1和USC_B1分别有中断向量USCI_B1和USCI_A1与之对应！

    所以USCI_A1和USCI_B1中断当然可以同时使用了！

  • 0 回复 Luo Peng
    Prodigy 20 points

    谢谢解答！！！