mkv31F256 pwm输出配置问题

eefocus_3800704

系统时钟为120MHz，PWM中心对齐，计划配置PWM周期10us，结果显示20US。程序如下

uint8_t regtemp;
         SIM->SCGC6  |= SIM_SCGC6_FTM0_MASK ;       /* ´ò¿ªFTMʱÖÓ    */
//    SIM->SOPT2  |= SIM_SOPT2_PLLFLLSEL_MASK | SIM_SOPT2_TPMSRC(1);  
//         SIM->SOPT2  |= SIM_SOPT2_PLLFLLSEL_MASK ;  

        FTM0->MODE |=0x05;
//        FTM0->CONF=0XC0;
//        FTM0->FMS=0X00;
//        FTM0->MOD  = 600;
       
        FTM0_CONF=0xC0; //set up BDM in 11
FTM0_FMS=0x00; //clear the WPEN so that WPDIS is set in FTM0_MODE register
FTM0_MOD=600;
FTM0->CONTROLS[0].CnSC =0x28; //High_Low_High for center-alignment
FTM0_C1SC=0x28;
FTM0_C2SC=0x28;
FTM0_C3SC=0x28;
FTM0_COMBINE|=0x2020; //enable update the FTM_C0V/FTM0_C1V register
FTM0_COMBINE|=0x0202; //complementary mode for CH0&CH1 of FTM0
FTM0_COMBINE|=0x1010; // dead timer insertion enabled in complementary mode //for CH0&CH1 of

FTM0_DEADTIME=0x00; //dead time is 0 system clock cycles
FTM0_C1V=100;
FTM0_C0V=100;
FTM0_C2V=100;
FTM0_C3V=100;
FTM0_CNTIN=0x00;
FTM0_SC=0x68; //do not start FTM0

求大神指点
       

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eefocus_3800704

另外请问该款芯片的PWM时钟，最高可以达到120MHz吗

小恩GG

the period is determined by 2 × (MOD − CNTIN)




如果你的主频配置成core clock=120MHz, 那么FTM最高频率的时钟源选择Bus Clock=60MHz.

Alan_3318a3

可以看範例的simple_pwm