HT32SX Monarch Scan
Monarch Scan application for HT32SX
Functions
STM32L0xx_System_Private_Functions
CMSIS » Stm32l0xx_system

Functions

void SystemInit (void)
 Setup the microcontroller system. More...
 
void SystemCoreClockUpdate (void)
 Update SystemCoreClock according to Clock Register Values The SystemCoreClock variable contains the core clock (HCLK), it can be used by the user application to setup the SysTick timer or configure other parameters. More...
 

Detailed Description

Function Documentation

◆ SystemCoreClockUpdate()

void SystemCoreClockUpdate ( void  )

Update SystemCoreClock according to Clock Register Values The SystemCoreClock variable contains the core clock (HCLK), it can be used by the user application to setup the SysTick timer or configure other parameters.

Note
Each time the core clock (HCLK) changes, this function must be called to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect.
- The system frequency computed by this function is not the real frequency in the chip. It is calculated based on the predefined constant and the selected clock source:
  • If SYSCLK source is MSI, SystemCoreClock will contain the MSI value as defined by the MSI range.
  • If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
  • If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
  • If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) or HSI_VALUE(*) multiplied/divided by the PLL factors.

(*) HSI_VALUE is a constant defined in stm32l0xx_hal.h file (default value 16 MHz) but the real value may vary depending on the variations in voltage and temperature.

(**) HSE_VALUE is a constant defined in stm32l0xx_hal.h file (default value 8 MHz), user has to ensure that HSE_VALUE is same as the real frequency of the crystal used. Otherwise, this function may have wrong result.

  • The result of this function could be not correct when using fractional value for HSE crystal.
    Parameters
    None
    Return values
    None

◆ SystemInit()

void SystemInit ( void  )

Setup the microcontroller system.

Parameters
None
Return values
None

< Set MSION bit

< Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], MCOSEL[2:0] and MCOPRE[2:0] bits

< Reset HSION, HSIDIVEN, HSEON, CSSON and PLLON bits

< Reset HSI48ON bit

< Reset HSEBYP bit

< Reset PLLSRC, PLLMUL[3:0] and PLLDIV[1:0] bits

< Disable all interrupts