您好!看到常见问题里面有这样的描述:
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Q: GPIO电平状态
除了XPD_DCDC,GPIO可以配置上拉;
关于 GPIO 的上电 IO 口默认状态为:除了 SDIO 6 根线+GPIO4+GPIO5+GPIO16 上电 IO 默认无上拉,其他的 GPIO 口均有上拉。
由于是内部配置上拉,所以如需下拉,需外部加下拉方式或者加一个三级管的反相电路。
PS: GPIO不能到5V。
GPIO4/5外接1M电阻不能上拉到高电平;需100K电阻。
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我的疑问如下:
“GPIO4+GPIO5上电默认无上拉,GPIO4/5外接1M电阻不能上拉到高电平;需100K电阻。” 是否意味着GPIO4+GPIO5不能通过启动后用PIN_PULLUP_EN(PIN_NAME)宏使能上拉电阻,必须得外接上拉电阻才能实现上拉?
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