Reference

Here is a list of all modules:

Peripheral Access	Describes naming conventions, requirements, and optional features for accessing peripherals
System and Clock Configuration
Interrupts and Exceptions (NVIC)	Describes programming of interrupts and exception functions
Core Register Access
Intrinsic Functions for CPU Instructions
Intrinsic Functions for SIMD Instructions [only Cortex-M4 and Cortex-M7]	Access to dedicated SIMD instructions
Systick Timer (SYSTICK)	Initialize and start the SysTick timer
Debug Access