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  1. I need to finish a program before I graduate. And I wrote one. However SIMULATOR displayed PWM CLOCK FASTER THAN FOSC When debugging. I can’t found troubles. My code is given below. Hope someoone here can help me ! The datasheet of DSPIC30F2020 #include <p30F2020.h> _FOSCSEL(FRC_PLL); //enable PLL,FRC crystal oscillator _FOSC(CSW_FSCM_OFF&FRC_HI_RANGE); //ban clock to switch,High frequency mode _FPOR(PWRT_128);//power on reset128MS _FWDT(FWDTEN_OFF); //The watchdog timer is prohibited _FGS(CODE_PROT_OFF);//Code protection closed 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; //Look-up table order register unsigned char sign; //Sine table output symbol float sin_l; void PortInit() { // LATE= 0x0000; // E pot reset TRISE = 0x0000; //set E pot to output , 0: out, 1: in TRISB = 0x0000; //set E pot to output, 0: out, 1: in PORTE = 0x0000; PORTB = 0x0000; OSCCONbits.TSEQEN=0;//OSCTUN TUN<3:0> in register adjust FRC oscillator OSCTUNbits.TUN = 0111; /* FRC时钟为15M */ } void PWM_Config() { FCLCON1=0X0003; // Disable the current limit and fault type IOCON1bits.PENH = 1; /* PWM1H PWM module will control PWM output pin */ IOCON1bits.PENL = 1; /* PWM1L PWM module will control PWM output pin */ IOCON1bits.PMOD = 00; /* Complementary output mode */ IOCON1bits.POLH = 0; //Effective if PWMxH pin is high level IOCON1bits.POLL = 0; /Effective if PWMxL pin is high leve /* Load PDTR1 and ALTDTR2 register with preset dead time value */ DTR1 = 64; /* Dead band time Settings */ ALTDTR1 = 64; /* dead time */ /* PHASE1 register */ PHASE1 = 0; /* No phase shift */ /* PWM Time Base Control Register */ PTCONbits.PTEN = 1; // enable PWM module PTCONbits.EIPU = 1; /Register/update immediately effective cycle PWMCON1bits.IUE = 1; //Update immediately effective pdc register PWMCON1bits.MDCS = 0;//PDC provide duty ratio PTPER = 47620; //30mips为47620 ,cycle=(PTPER+1)/120MHZ PDC1 = 0; //Duty ratio reset _PWM1IE=1;//Allow the interrupt request _PWM1IF=0;//Interrupt flag reset _PWM1IP=6; //set interrupt priority level to be 6 _IPL=1;//CPU interrupt priority level is 1 } int main() { num = 0; // A variable initialization sign = 0; PortInit() ; PWM_Config(); while(1);//Have been circulating wait for interrupt } void __attribute__((interrupt, no_auto_psv)) _PWM1Interrupt(void) { _PWM1IF=0;//Interrupt flag bit reset if (!num) /fi num=0,mean that every sign invert the look-up table cycle, used to determine the positive and negative half cycle waveform sign = ~sign; //0 to be 1 ++num; // Sine table order value if (num>=200) //reset num after checking 200 pots num = 0; sin_l= pwmtab[num]; PDC1=(unsigned char)sin_l;//The assignment if(sign) {PORTBbits.RB5=1;}//reversing else {PORTBbits.RB5=0;}// reversing } [/code[ Appreciation!