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使用F28M35的EPI的general Purpose mode时的SW、RD输出使能操作

在F28M35x的数据手册SPRUH22G(Revised January 2015)的1379页提到这样一段描述,如下:

而在EPIGPCFG register的详细介绍时(第1401页),并没有提到有RW bit的相关信息,如下:

我应该如何控制RD和WR的输出呢?