DSPIC33 EP64 MC202怎么做电路和如何配置

大家好，在我的项目中，我使用的是一个DSPIC33 EP64 MC202，它运行良好，但是，我怀疑我做的事情是正确的。我想避免未来的惊喜。我不知道该怎么做电路和如何配置它。电路：在图OSC1OSC2.JPG，在附件，是我的两个版本的振荡器的CRCUIT。在我的设计中，我使用了第一个版本，没有1M欧姆电阻。第二个版本是我认为正确的版本。CRISTAL是一个15MHz（15000 0H5M）的FiuSrave:最初，我做了一个配置，在一个分离的文件中，在没有外部振荡器的情况下启动：在初始化之后，我配置了我的设备，改变了振荡器的频率和ChsSe外部振荡器：疑惑：1）我的第一个问题是，一个是电路的正确版本？2）我的代码是否正确？即使第二个版本是正确的版本？（记住我的代码是基于电路的第一个版本，没有电阻器）任何帮助都将非常感激。



      以下为原文

    Hello all,

In my project I'm using a dsPIC33EP64MC202, and it is working fine, however, I have a doubt if I'm doing things the right way. I want to avoid surprises in the future. I'm in doubt how to do the circuit and how to configure it.

Circuit:
In the figure osc1osc2.jpg, at the attachments, are my two versions of the oscilator's crcuit. In my design I used the first version, without the 1M ohm resistor. The second version, is the version that I believe is correct. The cristal is a 15MHz (15.000H5M)
Firware:
Initially, I did a configuration, in a separated file, starting without the external oscillator:

// Select Internal FRC at POR
_FOSCSEL(FNOSC_FRC & IESO_OFF & PWMLOCK_OFF );
// Enable Clock Switching and Configure POSC in HS mode
_FOSC(FCKSM_CSECMD & OSCIOFNC_OFF & POSCMD_HS & IOL1WAY_OFF);

//Desliga o watchdog
_FWDT( FWDTEN_OFF )

//Ativa os pinos de debug EMUC2 e EMUD2 e deabilita os de JTAG.
_FICD( ICS_PGD2 & JTAGEN_OFF )

//Desabilita qualquer proteção de codigo para depuracao
_FGS( GWRP_OFF & GCP_OFF )

After that initialization, I configured my device and change the oscilator frequency and chosse external oscillator:


void oscilador_configuraOscilador(){

  CLKDIVbits.PLLPRE = 1; // N1 - 2
  CLKDIVbits.PLLPOST = 0; // (N2/2) - 1
  PLLFBDbits.PLLDIV = 46; // M - 2

  RCONbits.SWDTEN = 0;

  // Torna o clock do sistema Fcy igual ao clock do periférico Fp.
  CLKDIVbits.DOZE = 0x000;
  CLKDIVbits.DOZEN = 0;

  // Initiate Clock Switch to Primary Oscillator with PLL (NOSC=0b011)
  __builtin_write_OSCCONH(0x03);
  __builtin_write_OSCCONL(OSCCON | 0x01);

  // Wait for Clock switch to occur
  while (OSCCONbits.COSC!= 0b011);
  // Wait for PLL to lock
  while (OSCCONbits.LOCK!= 1);
}

Doubts:

1 ) My first question is, wich one is the correct version of the circuit?
2 ) Is my code correct ? Even if the second version is the correct version ? (Remembering that my code here was made based on the first version of the circuit, without the resistor)  

Any help would be very appreciated.

With my best regards.
Daniel.

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