为什么启用ADC之后PIC24FJ64GA002进行了褐变复位？

在启用ADC之后，我将用PIC24FJ64GA002进行褐变复位。我尝试的是（在伪代码中）：AD1.CON1=0x00E0；//ADC off，在采样AD1.CON2=0x0000结束之后自动转换；//使用MUXA，AVss和AVdd用作Vref+/-AD1.CON3=0x1F02；//采样时间=31Tad，Tad=3TcyAD1.CSSL=0x0000；//不需要扫描，AD1.CHS=4；//选择固定A/D通道，负输入为VR-AD1.CON1<15>；=1；//设置位15，PIC上的ADC配置成使用内部FRC振荡器和PLL(Fosc/2=16MHz)。和Vss。我可以重现切换ADC后不久PIC复位的问题。RCON寄存器之后包含0x0002，这意味着发生了褐变复位。在调试器中，如果在切换ADC之后设置了断点，然后立即继续，一切正常我搜索了论坛，发现PIC18也有类似的问题。我试过推荐的解决办法，但是没有帮助。这是已知的问题吗？PIC24还有工作吗？



      以下为原文

    I am getting brown-out resets with a PIC24FJ64GA002 after enabling the ADC.

What I am trying is (in pseudo code):
        AD1.CON1 = 0x00E0;      // ADC off, auto convert after end of sampling
        AD1.CON2 = 0x0000;      // use MUXA, AVss and AVdd are used as Vref+/-
        AD1.CON3 = 0x1F02;      // sample time = 31Tad, Tad = 3Tcy
        AD1.CSSL = 0x0000;      // no scanning required
        AD1.CHS = 4;                 // select fixed A/D channel, negative input is VR-
        AD1.CON1<15> = 1;      // set bit15, ADC on


The PIC is configured to use the internal FRC oscillator with PLL (Fosc/2=16MHz).
There is a low ESR 10uF cap at VCAP/VDDCORE and 100uF between Vdd and Vss.

I can reproduce the issue that shortly after the switching the ADC on, the PIC resets.
The RCON register contains 0x0002 after this, which means a brown-out reset happened.

In the debugger, if a set a break point after switching the ADC on,
and then immediately continue, everything works fine.
I searched the forum and found a similar issue with a PIC18.
I tried the recommended workaround but that didn't help.

Is this a known issue and is there a work around for the PIC24?