固件库中有这么一段：
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the Priority Grouping with 1 bit */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/* Enable TIM3 global interrupt with Preemption Priority 0 and Sub
Priority as 2 */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure(&NVIC_InitStructure);
/* Enable USART1 global interrupt with Preemption Priority 1 and Sub
Priority as 5 */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 5;
NVIC_InitStructure(&NVIC_InitStructure);
/* Enable RTC global interrupt with Preemption Priority 1 and Sub
Priority as 7 */
NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 7;
NVIC_InitStructure(&NVIC_InitStructure);
/* Enable EXTI4 interrupt with Preemption Priority 1 and Sub
Priority as 7 */
NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 7;
NVIC_InitStructure(&NVIC_InitStructure);
/* TIM3 interrupt priority is higher than USART1, RTC and EXTI4
interrupts priorities. USART1 interrupt priority is higher than RTC
and EXTI4 interrupts priorities. RTC interrupt priority is higher
than EXTI4 interrupt prioriy. */
问题：
RTC,EXTI4的NVIC_IRQChannelPreemptionPriority和NVIC_IRQChannelCmd为什么没有设置 |
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