IC693CHS393利用輸出比較產(chǎn)生頻率可變的PWM，原理簡(jiǎn)單介紹如下：
    首先配置定時(shí)器時(shí)基單元，確定脈沖小長(zhǎng)度單位CK。
    然后開啟定時(shí)器的輸出比較，設(shè)置模式為翻轉(zhuǎn)模式，并開啟輸出比較中斷。
    將定時(shí)器內(nèi)計(jì)數(shù)器CNT當(dāng)前值，加上脈沖長(zhǎng)度X(單位為CK)，寫入輸出比較寄存器。
    在X個(gè)CK后，將會(huì)觸發(fā)輸出比較中斷。同時(shí)電平翻轉(zhuǎn)。
    在中斷中再次將當(dāng)前計(jì)數(shù)器CNT的值，加上脈沖長(zhǎng)度X，寫入輸出比較寄存器。
    在X個(gè)CK后，將會(huì)觸發(fā)輸出比較中斷。同時(shí)電平翻轉(zhuǎn)。
    在中斷中再次將當(dāng)前計(jì)數(shù)器CNT的值，加上脈沖長(zhǎng)度X，寫入輸出比較寄存器。
    如此往復(fù)……
    以此即可得到一個(gè)占空比為50%，周期為2X個(gè)CK的PWM。

IC693CHS393  

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