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我想知道这个帖子的原理

https://e2echina.ti.com/question_answer/microcontrollers/hercules/f/70/p/104148/277698?tisearch=e2e-quicksearch&keymatch=uint8#277698

发帖人是如何解决问题的呢(我看他上次发帖子两年前了已经),是修改canREG1->IF1CMD  = (uint8) 0xF8U;将uint8变成uint32吗,

请问原理是什么呢?