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Re: 30F4011
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中級會員
 
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如果你是用APP020的實驗板的話,其震盪器為7.3728MHz
若選擇16 PLL,則PWM的Timer++時間為 1/29491200 = 33.90842 nS 我不清楚你講的高電壓是啥玩意 若你要你的PWM週期為1mS的話則 1.PTCKPS設為00 (00:三角波時脈輸入=系統時間*1) 2.PTPER設為29490 (29490 = 29491 - 1 而29491 * 33.9nS趨近於1mS) 因為震盪器的關係所以無法求得最準確的值,還有若是三角波選擇為連續向上向下計數模式則PTPER要代入14744
發表於: 2009/7/15 15:00
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30F4011
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新會員
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現在使用的是30F4011的開發板(與曾百由寫的數位說號控制器原理與應用 MPLAB C30開發實驗的電路板相同)，想請問一下怎麼計算他的工作週期以及如何設PWM，例如：每一個週期的高電壓設為1ms，要如何設定？
發表於: 2009/7/15 14:10
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