CMSIS Cortex-M33 Device Peripheral Access Layer System Source File. More...

#include "stm32c5xx.h"
#include <math.h>

Macros
#define	SYSTEM_CLOCK 48000000U

Functions
void	SystemInit (void)
	Setup the microcontroller system.

void	SystemCoreClockUpdate (void)
	Update SystemCoreClock variable according to Clock Register Values.

Variables
const VECTOR_TABLE_Type	__VECTOR_TABLE []

uint32_t	SystemCoreClock = SYSTEM_CLOCK

const uint8_t	AHBPrescTable [16] = {0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U, 6U, 7U, 8U, 9U}

const uint8_t	APBPrescTable [8] = {0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U}

Detailed Description

CMSIS Cortex-M33 Device Peripheral Access Layer System Source File.

This file provides two functions and one global variable to be called from user application:

SystemInit(): This function is called at startup just after reset and before branch to main program. This call is made inside the "startup_stm32c5xxxx.c" file.
SystemCoreClock variable: Contains the core clock (HCLK), it can be used by the user application to setup the SysTick timer or configure other parameters.
SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must be called whenever the core clock is changed during program execution.

After each device reset the HSIDIV (48 MHz) is used as system clock source. Then SystemInit() function is called, in "startup_stm32c5xxxx.c" file, to configure the system clock before to branch to main program.

This file configures the system clock as follows:

System Clock source | HSI

SYSCLK(Hz) | 48000000

HCLK(Hz) | 48000000

AHB Prescaler | 1

APB1 Prescaler | 1

APB2 Prescaler | 1

APB3 Prescaler | 1

PSI | Disabled

Require 48MHz for USB, | Disabled

SDIO and RNG clock |

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Attention

This software is licensed under terms that can be found in the LICENSE file in the root directory of this software component. If no LICENSE file comes with this software, it is provided AS-IS.

Macros

Functions

Variables