SAMD21 每个引脚都有上拉吗?
是的,ATSAMD21 系列微控制器在每个 Port A / Port B 引脚(如 PB03 或 PA14)上都有内部上拉(和下拉),除了 PA24 和 PA25。你可以在软件中启用或禁用上拉。
RESET 引脚也有一个始终激活且无法禁用的内部上拉。
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