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Part Number: TMS320F280049
肯定不能接地。
数字供电引脚有两类，3.3V VDDIO和1.2V VDD。
VDDIO就是给IO口供电的，VDD是给逻辑部分供电的。
可以两路电源轨都用外部供电；也可以VDDIO使用外部供电，VDD使用内部LDO生成。
