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TMS320F28033: 在主频60MHZ的背景下,SPI支持的最低速率是多少

Part Number: TMS320F28033

现设定主频为60MHZ,按照手册的公式计算后发现SPI的最低速率大概为120K,但我的外设芯片的SPI最高只支持64K。除了使用软件模拟SPI这个方法外,还有什么方法可以解决吗?