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cc2530 的 P11 引脚无法模拟IIC的SDA

Other Parts Discussed in Thread: CC2530

我在用CC2530 的 P11 和P20 两个引脚来模拟IIC接口, P20 作为SCL, P11 作为SDA, 调了好长时间都无法通行,但是将P11 和P20 对调一下,P11 做SCL, P20做SDA, 就没有问题。感觉是P11 在输入输出来回切换的时候会有问题,麻烦指点一下。