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CC2420 SPI register写入异常

Other Parts Discussed in Thread: CC2420, MSP430F1611

使用ARM9 SPI连接CC2420,通过SPI接口配置寄存器时,发现无法写入

电路中SPI CLK串接了470ohm电阻,将电阻修改为0ohm后,写入正常

但使用示波器测试信号发现,时钟信号串接470ohm电阻后边沿变缓,但并没有超出CC2420要求的最大100ns的要求

请帮忙解释一下是什么原因导致的这个问题,多谢~