MCU省晶振方案切换

Review Request #2510 — Created May 12, 2021 and updated — Latest diff uploaded

suqin
prj_share
suqin, wenbo

1、支持有晶振和无晶振两种模式;
2、无晶振条件下,可选择gpio输出14M pwm给xtal out脚;
3、增加lpm 例程;
4、修改所有例程的respin文件。



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