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时钟信号
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{| class="https://cn.bing.com/images/search?view=detailV2&ccid=LvD1ngaA&id=18910FDAA2E9294A25F93E4A606DC1BEB689C8C3&thid=OIP.LvD1ngaA6FM9QHZ4XkuoJgAAAA&mediaurl=https%3a%2f%2fbkimg.cdn.bcebos.com%2fpic%2f9922720e0cf3d7ca99f452daf51fbe096b63a918%3fx-bce-process%3dimage%2fwatermark%2cimage_d2F0ZXIvYmFpa2U3Mg%3d%3d%2cg_7%2cxp_5%2cyp_5%2fformat%2cf_auto&exph=188&expw=316&q=%e6%97%b6%e9%92%9f%e4%bf%a1%e5%8f%b7&simid=608020005008977446&FORM=IRPRST&ck=9EEF29A5BC9ADB1EECCBB8F84F2CFB61&selectedIndex=666&ajaxhist=0&ajaxserp=0" style="float:right; margin: -10px 0px 10px 20px; text-align:left"
|<center>'''时钟信号'''<br><img
src=" https://tse2-mm.cn.bing.comnet/imagesth/search?view=detailV2&ccid=LvD1ngaA&id=18910FDAA2E9294A25F93E4A606DC1BEB689C8C3&thid=/OIP-C.LvD1ngaA6FM9QHZ4XkuoJgAAAA&mediaurl=https%3a%2f%2fbkimg.cdn.bcebos.com%2fpic%2f9922720e0cf3d7ca99f452daf51fbe096b63a918%3fx-bce-process%3dimage%2fwatermark%2cimage_d2F0ZXIvYmFpa2U3Mg%3d%3d%2cg_7%2cxp_5%2cyp_5%2fformat%2cf_auto&exph=188&expw=316&q=%e6%97%b6%e9%92%9f%e4%bf%a1%e5%8f%b7&simid=608020005008977446&FORM=IRPRST&ck=9EEF29A5BC9ADB1EECCBB8F84F2CFB61&selectedIndex=666&ajaxhist?pid=0ImgDet&ajaxserprs=01 " width="280"></center><small> 圖片來自百度</small>
|}
==时钟边沿触发==