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lanjinghao
師夷洋技以制夷�。�！
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樓主  發(fā)表于: 2009-05-14 18:57
假設，程序中有個(gè)定時(shí)器T1，定時(shí)時(shí)間為50ms，執行整個(gè)程序1個(gè)周期耗時(shí)為20ms，那么執行第二個(gè)周期時(shí)定時(shí)器的時(shí)間是否要增加20ms？
偉大的光榮的正確的中國人民萬(wàn)歲��！
qwe123zxclk
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1樓  發(fā)表于: 2009-05-14 19:38
定時(shí)器應該是跟程序掃描同時(shí)進(jìn)行的，到程序掃描2個(gè)周期后，如果定時(shí)器在再過(guò)10MS后被掃描到，那么時(shí)間控制的是最精確的，如果定時(shí)器在2個(gè)周期+10MS之前就掃描了，那么到下一周期才會(huì )掃描到定時(shí)器輸出變化

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