Running STM32 without crystal

Posted on February 09, 2015 at 20:47

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Guru

Posted on February 09, 2015 at 21:12

The HSI clock has an asymmetrical duty cycle, so you have to divide it by TWO to get it symmetrical and then multiply by SIXTEEN

(8 / 2) * 16 = 64

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Guru

Posted on February 09, 2015 at 21:15

RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSI_Div2 | RCC_CFGR_PLLMULL16);

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