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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1090811/pca9539-port-logic-level-by-register-0-and-1
您好，支持团队：
我的客户在PCA9539中将所有端口设置为输出，他们想读取端口逻辑。 CanPCA9539通过读取寄存器0和1来显示端口逻辑，而不是读取寄存器2和3？
谢谢！
池田浩二
是；输入端口寄存器始终读取引脚处的电流电压。
