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首先要确定寄存器配置正确,检查33MHz的基频是否准确。大约10个芯片会出现5个芯片这种问题,检查焊接引脚处是否清洁。
电路不能显示,33MHz的晶振的负载电容多大?电路中XIN1和XIN2处接的多大的电容? 需要注意的是CDCE421A 在XIN1端内部有8pF负载,所以在XIN1处连接的电容值要要比XIN2处小8pF。