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    ID #1663

    What is SPI Mode?

    The SPI mode is an alternative operating mode that defined to use the memory cards without MMC/SDC native host interface. The communication protocol for the SPI mode is simple compared to the its native mode. The MMC/SDC can be attached to the most microcontrollers via a generic SPI interface or GPIO ports. Therefore the SPI mode is suitable for low cost embedded applications. Especialy, there is no reason to attempt to use native mode with a cheap microcontroller that has no native MMC/SDC interface. For SDC, the 'SPI mode 0' is defined for its SPI mode. For MMC , it is not the SPI timing, both latch and shift actions are defined with rising edge of the SCLK, but it seems work in SPI mode 0 in SPI mode. Thus the SPI Mode 0 (CPHA=0, CPOL=0) is the proper setting for MMC/SDC interface, but SPI mode 3 also works as well in most case.

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    Last update: 2011-01-18 18:20
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    Revision: 1.0

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