按照官方文档给出SBY模式下画的下载口,即RST脚上拉47K电阻,下拉1nf电容。上电单片机不能正常工作,再次上电单片机才能正常工作。第二次上电过程,电路其他部分电容已部分充电。将1nf电容换成0.5uf电容,单片机上电完全正常,但电容超过1nf,程序不能下载。有人能解答一下吗?
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