6SL3352-7AE32-1AA1
6SL3352-7AE32-1AA1
高頻信號輸入時,中斷進入很頻繁,如果是 100 K 頻率,你需要 5 us 進入一次(高低電平各一次,還是在占空比為 50 % 情況下,其它占空比條件更為苛刻),如果采用中斷處理方式,你在中斷中完成很多操作(清標志、計算、翻轉(zhuǎn)極性等),同時你需要保證這兩次中斷不能被全局中斷禁止,或者被高優(yōu)先級中斷打斷,否則,你得到的可能就不是一次脈沖的高電平了,這樣你的占空比、頻率都將計算出錯。
正因為有如上問題,而捕獲 PWM 脈沖又是比較常見的功能,所以需要一個的捕獲程序完成該工作。而魚鷹今天介紹的實現(xiàn)原理我認為就是的。
6SL3352-7AE32-1AA1
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