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发表于 2015-9-16 16:13:45
楼主
A summary of the frequency ratio restrictions between the bit-rate clock (sclk_out / sclk_in)
and the SPI peripheral clock (spi_clk) are described as,
When SPI Controller works as master, the F spi_clk >= 2 × (maximum F sclk_out )
When SPI Controller works as slave, the F spi_clk >= 6 × (maximum F sclk_in )
首先，SPI_CLK指的是SPI在APB上的时钟源，这个为48MHZ
SCLK_OUT，是SPI作为主设备时，通过SPI_SCLK产生出的SPI的输出CLK
SCLK_IN，是SPI作为从设备时的时钟输入 |
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