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CC2530: 不下拉的情况下,IO如何初始化完为低电平

Part Number: CC2530


P0DIR |= (0x10 | 0x20);

P0SEL |= (0x10 | 0x20);

这样初始化完IO一直为高电平,不接下拉的情况下如何初始化完为低电平