Check if Clock security system interrupt occurred or not.  
Reference Manual to 
LL API cross 
reference: 
  CIR CSSF LL_RCC_IsActiveFlag_HSECSS 
LL_RCC_IsActiveFlag_IWDGRST 
__STATIC_INLINE uint32_t LL_RCC_IsActiveFlag_IWDGRST 
(void ) 
Check if RCC flag Independent Watchdog reset is set or not.  
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LL API cross 
reference: 
  CSR IWDGRSTF LL_RCC_IsActiveFlag_IWDGRST 
LL_RCC_IsActiveFlag_LPWRRST 
__STATIC_INLINE uint32_t LL_RCC_IsActiveFlag_LPWRRST 
(void ) 
Check if RCC flag Low Power reset is set or not.  
Reference Manual to 
LL API cross 
reference: 
  CSR LPWRRSTF LL_RCC_IsActiveFlag_LPWRRST 
LL_RCC_IsActiveFlag_PINRST 
__STATIC_INLINE uint32_t LL_RCC_IsActiveFlag_PINRST 
(void ) 
Check if RCC flag Pin reset is set or not.  
Reference Manual to 
LL API cross 
reference: 
  CSR PINRSTF LL_RCC_IsActiveFlag_PINRST 
LL_RCC_IsActiveFlag_PORRST 
__STATIC_INLINE uint32_t LL_RCC_IsActiveFlag_PORRST 
(void ) 
Check if RCC flag POR/PDR reset is set or not.  
Reference Manual to 
LL API cross 
reference: 
  CSR PORRSTF LL_RCC_IsActiveFlag_PORRST