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STM32 系統(tǒng)時(shí)鐘復(fù)位與系統(tǒng)時(shí)鐘配置
復(fù)位：復(fù)位所有外設(shè) RCC->APB1RSTR = 0x0000 0000RCC->APB2RSTR = 0x0000 0000關(guān)閉所有外設(shè)時(shí)鐘 RCC->AHBENR = 0x0000 0014RCC->APB1ENR = 0x0000 0000RCC->APB2ENR = 0x0000 0000RCC->CR：打開(kāi) HSI，關(guān)閉 PLLON，HS
