怎么设置快速时钟PIC18f25k50时器件复位

我正在调试一个新的使用PIC18f25k50的u***供电的设计。我遇到的问题是，每当我试图把时钟改为16Mhz内部振荡器（从默认的1Mhz）时，电路板就会复位（调试器停止，然后转到PC=0）。8Mhz及以下工作正常，但在16Mhz时将立即复位。在调试过程中，我还发现：设置PLL_EN=on也会导致复位。从端口RC2驱动外部LED也会导致复位（大约8ma电流）。E毛刺由（略）更高的电流消耗引起。该设计已经在VDD/GND上有0.1UF上限，并且完全吸引了大约20Ma。我增加了另一个10UF到VDD/GND，但这没有效果。我还在MCLRb上加了0.1uF帽，但没有效果。只是帽子，MCLRb，USB连接，和LED（通常关闭）上拉。有什么想法？MPLABX，C18，pickit 3Startup代码和配置选项如下：#pragma配置CFGPLLEN=OFF//pll off on start#pragma配置CPUDIV=NOCLKDIV//使用48MHz时钟作为cpu时钟=48MHz/1=48MHz////pragma配置CPUDIV=CLKDIV2//使用24MHz时钟作为cpu时钟=48MHz/2=24MHz#pragma配置LS48MHSYS48X8//系统时钟是48Mhz=SYS48X8//系统时钟是48Mhz#pragma配置FOSC=INTOSCIO//内部振荡器，\#pragma配置IESO IESO IESO=OFF///\\\\#pragma配置配置IESO配置IESO IESO IESO IESO IESO IESO IESO=OFF=OFF//////\\\\\\\\\gBORV=190#pragma配置WDTEN=OFF#pragma config WDTPS=32768#pragma config CCP2MX=RB3//#pragma config CCP2MX=RC1#pragma config PBADEN=OFF#pragma config SDOMX=RC7#pragma config MCLRE=ON//使用mclrB重置输入//#pragma config DEBUG=ON//RB6和RB7作为调试器。#pragma配置XINST=OFF//扩展指令.=off#pragma配置STVREN=ON#pragma配置LVP=OFFStartup code://禁用一些默认ADCON1|=0b1111;//all pins.//CVRCON=0b00000000;//set.(.)//大多数设置都在配置位中(io_cfg.h)。OSCCON2bits.INTSRC=1;OSCCON2bits.OSCCON2bits.PLLEN=0；//pll必须被禁用以控制OSCTUNEbits.PLCLONONONONONON2比特.PLLELEN=0；//pll必须被禁用以控制OSCTUNUNUNEbits.PLCTONEbits.PLUNONONONONONONONONONONON比特=0；//SPLLPLCLCLCLMUMULT=1；//3xplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplplpll//OSCTUNEbits.SPLLMULT=1 int//这是c引发崩溃/重置OSCCONbits.IRCF=0x6；//8Mhzint//这还可以//OSCCON=0x70；//使用内部时钟（16MHzxtalx3PLL=48MHz），同时（！OsCONBITS.HFIFOs）{}//OsCON2BIT.PLLEN＝1；//这一个也会崩溃我们/ /（）！{UCFGbits.PLLRDY){{{UCFGbits.FSEN=1；//启用全速u*** ACTCON比特.ACTSRC=1；//启用全速u*** ACTCON比特.ACTCON比特.ACFGbits.PLLRDY){{{UCFG比特.FSEN=1；///启用全速u*** u*** ACTCONbits ACTCON比特.ACTSRCRCRCRCRCRCRCRCRC=1；//u*** u***源ACTCON比特/u***源ACTCON比特=1；///启用主动调谐//设置IR IO//启用激活调谐//设置IR IO//所有IO//所有IO//除了调试器LATC=0xff；//LED OFF//TRISC=0x03；//除了1/0TRISC=0xfb之外的所有输出；//除了2 LATC=0xf0；//LED ON之外的所有输入，这会导致崩溃（驱动外部LED，8mA）ANSELC=0；



      以下为原文

    I am debugging a new u*** powered design using the PIC18f25k50.

The problem I am running into is the board will reset (debugger stalls then goes to PC=0) whenever I try to change the clock to 16Mhz internal oscillator (from the default 1 Mhz).  8 Mhz and below works ok, but at 16Mhz it will immediately reset every time.

In the debug process, I have also found that:
   Setting PLL_EN = on will also cause the reset
   Driving an external LED from port RC2 will also cause the reset  (around 8ma of current)

These made me think the problem was a voltage glitch causes by (slightly) higher current consumption.  The design already had a 0.1uF cap on VDD/GND and totally draws around 20mA.  I added another 10uF to VDD/GND but this had no effect.  I also added 0.1uF cap on MCLRb still with no effect.

There is very little external circuitry.  Just the caps, pull ups on MCLRb, USB connection, and the LEDs (normally off).

Any ideas?

MPLABX, C18, pickit 3

Startup code and config options below:

#pragma config CFGPLLEN = OFF // pll off on startup
#pragma config CPUDIV = NOCLKDIV //Use 48MHz clock for cpu clock = 48MHz/1 = 48MHz
//#pragma config CPUDIV = CLKDIV2 //Use 24MHz clock for cpu clock = 48MHz/2 = 24MHz
#pragma config LS48MHZ = SYS48X8 //system clock is 48Mhz
#pragma config FOSC = INTOSCIO // Internal oscillator,

#pragma config IESO = OFF

//#pragma config FCMEN = OFF
#pragma config FCMEN = ON

//#pragma config PWRTEN = OFF
#pragma config BOREN = ON
//#pragma config BOREN = OFF
#pragma config BORV = 190
#pragma config WDTEN = OFF
#pragma config WDTPS = 32768

#pragma config CCP2MX = RB3
//#pragma config CCP2MX = RC1
#pragma config PBADEN = OFF
#pragma config SDOMX = RC7
#pragma config MCLRE = ON // use mclrB reset input
//#pragma config DEBUG = ON // RB6 and RB7 for debugger..
#pragma config XINST = OFF // extended instruction enable = off
#pragma config STVREN = ON
#pragma config LVP = OFF

Startup code:
//disable some defaults
ADCON1 |= 0b1111; //all pins digital
//CVRCON = 0b00000000;
// set clock (internal)
// most of the settings are in the configuration bits (io_cfg.h)

OSCCON2bits.INTSRC = 1;
OSCCON2bits.PLLEN = 0; // pll must be disable to control
OSCTUNEbits.SPLLMULT = 1; //3xpll
//OSCTUNEbits.SPLLMULT = 0; //4xpll
//OSCCONbits.SCS = 0x3;
OSCCONbits.SCS = 0x0; // should use pll clock output for system clock
//OSCCONbits.IRCF = 0x7; //16Mhz int // this was causing crash/reset
OSCCONbits.IRCF = 0x6; //8Mhz int // this is ok
//OSCCON = 0x70; // use internal clock (16MHz xtal x3PLL = 48MHz)
while (!OSCCONbits.HFIOFS){}

//OSCCON2bits.PLLEN = 1; // this one also crashes us
//while (!OSCCON2bits.PLLRDY){}

UCFGbits.FSEN = 1; // enable full speed u***

ACTCONbits.ACTSRC = 1; // u*** source
ACTCONbits.ACTEN = 1; // enable active tuning

// set IR IO
// all IO default to inputs
TRISA = 0xff; // all inputs
//TRISA = 0x00; // all outputs
TRISB = 0xff; // all inputs
//TRISB = 0xc0; // all outputs except debugger
LATC = 0xff; // LED OFF
//TRISC = 0x03; // all outputs except 1/0
TRISC = 0xfb; // all inputs except 2
LATC = 0xf0; // LED ON       this causes crash  (drives external LED, 8mA)
ANSELC = 0;