描述:Quartz Crystal Resonator HC49/UP Short 2 Pad Surface Mount (SMD) 3.2mm Height Metal Resistance Weld Seal Quartz Crystal Resonator HC49/UP Short 2 Pad Surface Mount (SMD) 3.2mm Height Metal Resistance Weld Seal 是否Rohs认证:符合 Brand Name:Ecliptek 是否无铅:不含铅
之前使用KEIL,里面会有个函数SystemCoreClockUpdate()首先配置始终,然后使用如下代码来初始化systick:void SysTick_Init(void){NVIC_DisableIRQ(SysTick_IRQn);if(SysTick_Config(SYSTICK_TIMER_10MS/*ms*/))/* Setup SysTick Timer for 10 msec i
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