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dap 28335启动口

在28335启动上电启动或者复位启动之后需要读取GPIO84-GPIO87这四个脚的电平信号,只有读到高电平才能进入到flash开始运行程序。如果GPIO84-GPIO87这四个脚悬空的情况下片内的上拉电阻会不会工作让4个IO口为高电平?还是说我硬件上必须接个上拉电阻接3.3V的?