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F28M35的1.8V与1.2V



我看资料中提到F28M35的1.8V与1.2V既可以外部够给也可以内部自己产生,请问在使用效果上有什么区别么?内部的会不会有抗干扰弱些或影响其他管脚的带载能力之类的问题呢?