|  | CMSIS-CORE
    Version 3.20
    CMSIS-CORE support for Cortex-M processor-based devices | 
|  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] | Access to dedicated SIMD instructions | 
|  Systick Timer (SYSTICK) | Initialize and start the SysTick timer | 
|  Debug Access |