PORTF引脚0导致复位，dsPIC33E64MC206

我一辈子都弄不清楚发生了什么，我有一个按钮重置我的控制器。我有一个机智开关，开关3.3V（已验证）到10k下拉并联连接到RF0的0.1uF盖，如前所述，当按下重置控制器时。起初我以为我可能有一个意外的中断，所以在只配置了振荡器之后，我把代码更改为只在while循环中停留一段时间，从而消除了任何错误的代码问题。按下按钮仍然导致复位。我检查短路，在开关打开和关闭时测量RF0，并验证Vcap的电压没有下降。有3.3V的驱动，一些反弹明显但没有疯狂，Vcap是稳定的。我还验证了相同的复位误差在3个单独的，尽管假定是电相同的PCBs。重置也发生在调试和编程模式。RCON只返回一个POR和BOR，我在常规运行模式下也把RCON放到LCD上，它显示相同的结果。现在，这里是我迷路的地方。我拆掉了外部10K下拉和0.1uF盖，启用了内部下拉电阻器，一切正常。按钮工作，我看到它改变，没有复位等。是的，它工作，但有什么事情将要咬我更进一步的道路？我愿意接受任何想法或建议。谢谢你，肖恩。



      以下为原文

    I cannot for the life of me figure out what is going on, I have a push button resetting my controller.

I have a tact switch switching 3.3V (verified) into a 10k pull down in parallel with a 0.1uF cap connected to RF0, which as stated, when pressed resets the controller.  At first I thought I might have an unintended interrupt, so I changed the code to just sit in a while loop after configuring the oscillator only, removing any errant code issues. Pushing the button still caused a reset.

I checked for shorts, measured RF0 with the switch open and closed, and verified the voltage at Vcap wasn't dropping on me.   There is 3.3V on actuation, some bounce obviously but nothing crazy, and Vcap is steady. I also verified the same reset error on 3 separate, albeit supposedly electrically identical, PCBs.  The reset also occurs in both debug and programmed mode.  RCON only returns a POR and BOR, I threw RCON on to the LCD in regular running mode as well and it shows identical results.

Now, here is where I get lost.  I removed the external 10K pull down and 0.1uF cap, enabled the internal pull down resistor and everything works like it is supposed to. The button works, I see it change, nothing resets etc.

Yeah it works, but is there something happening that is going to bite me further down the road? I am open to any thoughts or suggestions.


Thanks in advance.

Shaun