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wdcai
Visitor II
May 20, 2004
Question

upsd33xx spi interface problem

  • May 20, 2004
  • 3 replies
  • 593 views
Posted on May 20, 2004 at 23:06

upsd33xx spi interface problem

    This topic has been closed for replies.

    3 replies

    W
    wdcaiAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:00

    Hi,All

    There is a host spi controller in upsd33xx series,but only one spi slave chip select signal is provided, how can I connect another spi device? I can use cd4051 cmos swicth to do this, but I want to know whethwer GPIO pins such like P1 port can be used as chip select signals?

    Thanks!
    S
    sjo
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:00

    just clear SSEL bit to disable the CS line, then you can use GPIO to manually set the CS line of your choice before loading the data.

    Regards

    sjo
    W
    wdcaiAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:00

    that is to say those signal spicclk,spirxd,spitxd will run normally in SPI interrupt mode using GPIO as chipselect signals of other spi slave device! is it OK?

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