毕设的题目，自己编了个程序，但在调试时SIMULATOR提示PWM CLOCK FASTER THAN FOSC，不知道怎么回事，贴一下我的代码，希望大神能指导一下！
#include <p30F2020.h>
_FOSCSEL(FRC_PLL); //使能PLL，FRC晶振
_FOSC(CSW_FSCM_OFF&FRC_HI_RANGE); //禁止时钟切换,高频模式
_FPOR(PWRT_128);//上电复位128MS
_FWDT(FWDTEN_OFF); //禁止看门狗定时器
_FGS(CODE_PROT_OFF);//代码保护关闭
unsigned int const pwmtab[200] = {0,631,1262,1892,2522,3152,3781,4409,5035,5661,6285,6908,7528,8147,8764,9379,
9992,10602,11209,11814,12416,13015,13610,14202,14791,15376,15957,16534,17107,17676,18241,18801,
19356,19907,20453,20993,21529,22059,22584,23103,23617,24124,24626,25122,25611,26094,26571,27041,
27505,27961,28411,28854,29289,29718,30139,30553,30959,31357,31748,32131,32506,32873,33232,33582,
33925,34259,34584,34901,35210,35509,35800,36082,36355,36620,36875,37121,37358,37586,37804,38013,
38213,38403,38584,38755,38917,39069,39212,39345,39468,39581,39685,39779,39863,39937,40001,40056,
40100,40135,40160,40175,40180,40175,40160,40135,40100,40056,40001,39937,39863,39779,39685,39581,
39468,39345,39212,39069,38917,38755,38584,38403,38213,38013,37804,37586,37358,37121,36875,36620,
36355,36082,35800,35509,35210,34901,34584,34259,33925,33582,33232,32873,32506,32131,31748,31357,
30959,30553,30139,29718,29289,28854,28411,27961,27505,27041,26571,26094,25611,25122,24626,24124,
23617,23103,22584,22059,21529,20993,20453,19907,19356,18801,18241,17676,17107,16534,15957,15376,
14791,14202,13610,13015,12416,11814,11209,10602,9992,9379,8764,8147,7528,6908,6285,5661,
5035,4409,3781,3152,2522,1892,1262,631};
unsigned char num; //查表顺序寄存器
unsigned char sign; //正弦表输出标志
float sin_l;
void PortInit()
{
// LATE= 0x0000; // E端口清零
TRISE = 0x0000; // E端口设为输出, 0: out, 1: in
TRISB = 0x0000; // E端口设为输出, 0: out, 1: in
PORTE = 0x0000;
PORTB = 0x0000;
OSCCONbits.TSEQEN=0;//OSCTUN 寄存器中的 TUN<3:0> 位调节 FRC 振荡器
OSCTUNbits.TUN = 0111; /* FRC时钟为15M */
}
void PWM_Config()
{
FCLCON1=0X0003; //禁用电流限制和故障输入
IOCON1bits.PENH = 1; /* PWM1H PWM 模块将控制 PWM输出引脚 */
IOCON1bits.PENL = 1; /* PWM1L PWM 模块将控制 PWM输出引脚 */
IOCON1bits.PMOD = 00; /* 互补输出模式 */
IOCON1bits.POLH = 0; //PWMxH 引脚为高电平有效
IOCON1bits.POLL = 0; //PWMxL 引脚为高电平有效
/* Load PDTR1 and ALTDTR2 register with preset dead time value */
DTR1 = 64; /* 死区时间设置 */
ALTDTR1 = 64; /* 死区时间 */
/* PHASE1 register */
PHASE1 = 0; /* No phase shift */
/* PWM Time Base Control Register */
PTCONbits.PTEN = 1; // 使能PWM模块
PTCONbits.EIPU = 1; //立即更新有效周期寄存器
PWMCON1bits.IUE = 1; //立即对有效的pdc寄存器进行更新
PWMCON1bits.MDCS = 0;//PDC提供占空比
PTPER = 47620; //30mips为47620 ，周期=（PTPER+1）/120MHZ
PDC1 = 0; //占空比清零
_PWM1IE=1;//允许中断请求
_PWM1IF=0;//中断标志清零
_PWM1IP=6; //中断优先级设为6
_IPL=1;//CPU中断优先级为1
}
int main()
{
num = 0; // 个变量初始化
sign = 0;
PortInit() ;
PWM_Config();
while(1);//一直循环等待中断
}
void __attribute__((interrupt, no_auto_psv)) _PWM1Interrupt(void)
{
_PWM1IF=0;//中断标记位清零
if (!num) //如果num=0，意味着 每一次查表循环完毕标志取反,用以确定正负半周波形
sign = ~sign; //0变1
++num; // 正弦表顺序取值
if (num>=200) //200个点查完后清num
num = 0;
sin_l= pwmtab[num];
PDC1=(unsigned char)sin_l;//赋值
if(sign)
{PORTBbits.RB5=1;}//换向
else
{PORTBbits.RB5=0;}//换向
}
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