当PICKIT3从目标移除时系统挂起是什么原因

我有一个PIC18F625i调试系统，它使用MPLABX和一个PICtiT3程序。只要拾取器保持在系统中，它就工作良好，但是如果我删除它，系统就会挂起（很明显，我指的是在为独立操作编程芯片之后的阶段）。只需把拾音器塞住并重新设置系统，它就可以工作了。我有三种不同设计的相同芯片，它只在其中一种设计上运行。我不知道它是否与此有关，但设计之间的唯一主要区别是（PIC电路）。问题板有许多未使用的PIC引脚，它们没有被终止（我将未使用的引脚设置为输出，并将它们强制为低）。有一点似乎有某种效果——我使用UART端口和基于中断的代码。如果我使用串行端口留下代码，那么它似乎立即挂起（很难确切地告诉我，因为我不能使用PIDIT调试）。如果我删除代码，那么它工作几秒钟，然后挂起。T0也使用中断。然而，与中断相同的代码被用于其他没有任何问题的板中，当它被移除时（在所有板上相同）都没有使用任何建议。



      以下为原文

    I have a system with a PIC18F6527
I debug and program it using MplabX and a PicKit3.
As long as the PicKit remains plugged in the system it works fine, but if I remove it the system hangs (obviously I am referring to the stage after programming the chip for standalone operation). Just plugging back the PicKit and resetting the system - it works fine.
I have the same chip on three different designs and it behaves so only on one of the designs.
I do not know if it has anything to do with this, but the only major difference between the designs (in terms of the PIC circuitry) is that the problematic board has many unused PIC pins which are not terminated (I set the unused pins as outputs and force them to low).

One thing which seems to have some kind of effect - I use both UART ports with interrupt based code. If I leave the code using the serial ports then it seems to hang immediately  (hard to tell exactly where since I cannot use the PicKit to debug). If I eliminate the code then it works for several seconds and then hangs. T0 also uses interrupts. However the same code with the interrupts is used in the other boards that do not have any problem

Pickit pins are left unused when it is removed (same on all boards)

Any suggestions?