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TMS320F28075: 关于TMS320F2807芯片的频率捕获模块的引脚问题

Part Number: TMS320F28075

C2000给出的官方例程中,关于TMS320F2807芯片的《ecap_capture_pwm》例程中, InitECap1Gpio(19);是使用GPIO19作为输入捕获引脚,可是在TMS320F2807x芯片的数据手册中,GPIO19并不具备输入捕获功能,请问这是什么原因呢?