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CC254x datasheet里P1.1/P1.0口的电流20mA是最大允许的电流吗？是从P1.1里拉出来，还是灌进去？
其他IO口的电流4mA是最大允许的电流吗？是从IO口里拉出来，还是灌进去？
应用中对端口电流有什么要求吗？
20mA是P1.1/P1.0口的最大输出驱动电流
