{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","id":"38270854-596f-4a26-8183-db8c968c6020","uuid":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","normalized_title":"编码隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","isbns":["9787121181184","0123456789","6044921875","3039331000","0000000000","0000000000000"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":438,"navigation_url":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020","title_url":"https://workshop.closeclaw.top/ai/title/%E7%BC%96%E7%A0%81%20%E9%9A%90%E5%8C%BF%E5%9C%A8%E8%AE%A1%E7%AE%97%E6%9C%BA%E8%BD%AF%E7%A1%AC%E4%BB%B6%E8%83%8C%E5%90%8E%E7%9A%84%E8%AF%AD%E8%A8%80","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/38270854-596f-4a26-8183-db8c968c6020","page_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/page","search_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/search"},"page":{"printed_page":183,"pdf_page":199,"physical_index":199,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"748c2d05ca5887c47ce09c7eaed7932d996c87f3bb71abf9416cea29b9ea1cbe"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"可以看出，这个电路不仅仅具备了一个计数功能。当然，如果在这个电路中添加更多的触发器，其计数范围就会更大。在第8章中提到一个顺序递增的二进制序列，每一列数字在0和1之间的变化频率是其右边那一列数字变化频率的一半，这个计数器就是模仿了这一点。在每一次时钟信号的正跳变时，计数器的输出是增加的，即递增1。\n\n把8个触发器连接在一起，然后放入一个盒子中，构成了一个8位计数器。\n\n这个计数器称为 $^ { * } { } 8$ 位行波计数器”，因为每一个触发器的输出都是下一个触发器的时钟输入。变化是在触发器中---级一级地顺序传递的，最后一级触发器的变化必定会有一些延迟，更先进的计数器是“并行（同步）计数器”，这种计数器的所有输出是在同一时刻改变的。\n\n在计数器中输出端用 ${ \\bf Q } _ { 0 } \\sim { \\bf Q } _ { 7 }$ 标记，在最右边的 $\\mathbf { Q } _ { 0 }$ 是第一个触发器的输出。如果将灯泡连到这些输出端上，就可以将8位数字读出来。\n\n这样一个计数器的时序图可以将8个输出分别表示出来，也可以将它们作为整体一起表示出来，如下图所示。\n\n14 反馈与触发器\n\n183","previous_page":182,"next_page":184}