[问答]

如何在PIC16F877A中配置看门狗定时器？

问答对人有帮助，内容完整，我也想知道答案 0 海都。看门狗定时器究竟是什么？它是导致复位的计时器吗？如果是这样，我需要做什么在我的照片？我听说我们需要在opthyReg中设置PSA，这意味着每当定时器溢出时，就会产生重置。但实际上，当PIC卡在执行程序时，它应该重置。不是吗？那么，看门狗定时器如何知道程序何时卡住&有效重置，我想在程序卡住时创建重置？那我该怎么办？还解释了在MCU中睡眠意味着什么？什么时候发生？如何使单片机休眠？如果我想唤醒MCU，我该怎么办？我可以通过看门狗定时器或任何中断吗？我在论坛上看到了很多疑问和回答。但这让我感到困惑，任何人都能给我一个清晰的解释。谢谢您。。。。。以上来自于百度翻译以下为原文 Hai All. What is watchdog timer actually? Is it a timer which cause reset? If so what i need to do make that work in my pic? I heard we need to set PSA in OPTION_REG, that means whenever timer overflows it creates reset. But actually it should do reset when the pic stuck in executing the program. Isn't it? SO, how watchdog timer knows when the program stuck & effectively reset, i want to create a reset when the program stuck? for that what i should do?? And also explain me what is mean by sleep in mcu? when it happens ? how to make the mcu sleep? If i want to wake up the mcu , what i should do? can i do by Watchdog timer or any interrupt? I saw many queries & replies in the forum. But it confused me. Anyone give me the crystal clear explanation. THANK YOU..... 0
2019-6-5 15:17:22　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × qun333 该类别下有 57 个回答。邀请回答 caoguiqun 该类别下有 56 个回答。邀请回答技术发广告该类别下有 56 个回答。邀请回答 psw30 该类别下有 44 个回答。邀请回答伊丹姿子该类别下有 41 个回答。邀请回答 uwufwjrw 该类别下有 39 个回答。邀请回答 hetao1111 该类别下有 38 个回答。邀请回答 lc123617 该类别下有 35 个回答。邀请回答欧阳大大该类别下有 32 个回答。邀请回答作死不止该类别下有 31 个回答。邀请回答 asd010 该类别下有 31 个回答。邀请回答 60user92 该类别下有 29 个回答。邀请回答 wy8719 该类别下有 29 个回答。邀请回答 ju978779 该类别下有 28 个回答。邀请回答嘻嘻爱哈哈该类别下有 28 个回答。邀请回答 haikitty 该类别下有 28 个回答。邀请回答 xiuzhen122 该类别下有 27 个回答。邀请回答 pol666 该类别下有 27 个回答。邀请回答 ueywyrsdfs 该类别下有 26 个回答。邀请回答 lhly23 该类别下有 25 个回答。邀请回答举报赵护林相关推荐 • 如何在我们的TCP/IP演示应用中添加一个看门狗定时器？ 1868 • 什么是看门狗定时器？嘀嗒定时器具有哪些功能？ 1160 • PIC16f877a的配置位怎么配置？在程序里该怎么描述？？？ 3552 • 怎样去使用看门狗定时器呢 1672 • 看门狗定时器的特性都有哪些呢 1487 • 如何对看门狗定时器WDT进行配置呢 1141 • 怎么使用看门狗定时器？ 1597 • 关闭看门狗定时器中断的步骤有哪些 1241 • Kintex 7如何配置看门狗定时器？ 3390 • 看门狗定时器在使用内部振荡器作为主时钟源时导致复位 1537 1个回答

答案对人有帮助，有参考价值 0 一旦激活（这是通过PIC的CONFIG单词进行的），您必须每隔几毫秒重置一次WDT。数据表解释了如何重置WDT。如果您的软件在没有重置定时器的循环中停滞不前，那么一段时间之后它将导致重置。您必须安排您的软件以便重置。如果它正常运行，它将继续定期重置WDT，但如果代码被卡住，则不会重置它。您的问题都表明您没有花时间阅读PIC的数据表。还要注意，PIC16F877是一个非常旧的设备。微芯片制造类似的设备更便宜，更快，更容易设计，也更容易调试。看看PIC16F1xx系列。顺便说一下，您已经在“C18”论坛上发布了这个问题，它不适用于PIC16F设备。你应该张贴在“PIC微控制器（PIC10F，PIC12F，PIC16F，PIC18F）”论坛上。以上来自于百度翻译以下为原文 Once activated (which you do via the PIC's CONFIG words), you must reset the WDT every few milliseconds. The datasheet explains how to do that. If your software gets stuclk in a loop where it is not resetting the timer, then after a certain ime it wil cause a reset. You must arrange your software so that if it is running normally, it will keep resetting the WDT regularly, but not reset it if your code gets stuck. Your questions all indicate that you have not taken the time to read though the datasheet for your PIC. Also note, the PIC16F877 is a very old device. Microchip make similar devices which are cheaper, faster, easier to design around, and easier to debug. Look at the PIC16F1xxx family. Also, byu the way, you have posted this question in the "C18" forum, which is not applicable for a PIC16F device. You should have posted in the "PIC Microcontrollers (PIC10F, PIC12F, PIC16F, PIC18F)" forum.

2019-6-5 15:33:42 评论举报王焕树