当HSI被用于作为PLL时钟的输入时，系统时钟能得到的最大频率是64MHZ。
STM3210X_RCC.H头文件，主要是对RCC相关的寄存器进行了一个重新的定义命名以及对.c文件中的函数进行申明。
可以从参考手册的6.3 RCC寄存器描述了解到。更加详细的内容
/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_rcc.h
* Author : MCD Application Team
* Version : V2.0.2
* Date : 07/11/2008
* Description : This file contains all the functions prototypes for the
* RCC firmware library.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __STM32F10x_RCC_H
#define __STM32F10x_RCC_H
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_map.h"
/* Exported types ------------------------------------------------------------*/
typedef struct
{
u32 SYSCLK_Frequency;
u32 HCLK_Frequency;
u32 PCLK1_Frequency;
u32 PCLK2_Frequency;
u32 ADCCLK_Frequency;
}RCC_ClocksTypeDef; //定义结构体
/* Exported constants --------------------------------------------------------*/
/* HSE configuration */
/********RCC_CR时钟控制寄存器***********
第16位：HSE ON 外部高速时钟使能
0：HSE振荡器关闭
1：HSE振荡器开启
第18位：HSEBYP 外部高速时钟旁路
0：外部4-16MHZ振荡器没有旁路
1：外部4-16MHZ外部晶体振荡器被旁路
***************END**********************/
#define RCC_HSE_OFF ((u32)0x00000000)
#define RCC_HSE_ON ((u32)0x00010000)
#define RCC_HSE_Bypass ((u32)0x00040000)
#define IS_RCC_HSE(HSE) (((HSE) == RCC_HSE_OFF) || ((HSE) == RCC_HSE_ON) || \
((HSE) == RCC_HSE_Bypass))
/* PLL entry clock source */
/********RCC_CFGR时钟配置寄存器***********
第16位：PLLSRC PLL输入时钟源
0：HSI振荡器时钟经2分频后作为PLL输入时钟
1：HSE时钟作为PLL输入时钟
第17位：PLLXTPRE HSE分频器作为PLL输入
0：HSE 不分频
1：HSE 2分频
***************END**********************/
#define RCC_PLLSource_HSI_Div2 ((u32)0x00000000)
#define RCC_PLLSource_HSE_Div1 ((u32)0x00010000)
#define RCC_PLLSource_HSE_Div2 ((u32)0x00030000)
#define IS_RCC_PLL_SOURCE(SOURCE) (((SOURCE) == RCC_PLLSource_HSI_Div2) || \
((SOURCE) == RCC_PLLSource_HSE_Div1) || \
((SOURCE) == RCC_PLLSource_HSE_Div2))
/* PLL multiplication factor */
/********RCC_CFGR时钟配置寄存器***********
第21：18位：PLLMUL PLL倍频系数
由软件设置来确定PLL倍频系数，只有在PLL关闭的情况下才能被写入
注意：PLL的输出频率不能超过72MHZ
***************END**********************/
#define RCC_PLLMul_2 ((u32)0x00000000)
#define RCC_PLLMul_3 ((u32)0x00040000)
#define RCC_PLLMul_4 ((u32)0x00080000)
#define RCC_PLLMul_5 ((u32)0x000C0000)
#define RCC_PLLMul_6 ((u32)0x00100000)
#define RCC_PLLMul_7 ((u32)0x00140000)
#define RCC_PLLMul_8 ((u32)0x00180000)
#define RCC_PLLMul_9 ((u32)0x001C0000)
#define RCC_PLLMul_10 ((u32)0x00200000)
#define RCC_PLLMul_11 ((u32)0x00240000)
#define RCC_PLLMul_12 ((u32)0x00280000)
#define RCC_PLLMul_13 ((u32)0x002C0000)
#define RCC_PLLMul_14 ((u32)0x00300000)
#define RCC_PLLMul_15 ((u32)0x00340000)
#define RCC_PLLMul_16 ((u32)0x00380000)
#define IS_RCC_PLL_MUL(MUL) (((MUL) == RCC_PLLMul_2) || ((MUL) == RCC_PLLMul_3) || \
((MUL) == RCC_PLLMul_4) || ((MUL) == RCC_PLLMul_5) || \
((MUL) == RCC_PLLMul_6) || ((MUL) == RCC_PLLMul_7) || \
((MUL) == RCC_PLLMul_8) || ((MUL) == RCC_PLLMul_9) || \
((MUL) == RCC_PLLMul_10) || ((MUL) == RCC_PLLMul_11) || \
((MUL) == RCC_PLLMul_12) || ((MUL) == RCC_PLLMul_13) || \
((MUL) == RCC_PLLMul_14) || ((MUL) == RCC_PLLMul_15) || \
((MUL) == RCC_PLLMul_16))
/* System clock source */
/********RCC_CFGR时钟配置寄存器***********
第1:0位：SW[1:0] 系统时钟切换
00：HSI作为系统时钟
01：HSE作为系统时钟
10：PLL输出作为系统时钟
***************END**********************/
#define RCC_SYSCLKSource_HSI ((u32)0x00000000)
#define RCC_SYSCLKSource_HSE ((u32)0x00000001)
#define RCC_SYSCLKSource_PLLCLK ((u32)0x00000002)
#define IS_RCC_SYSCLK_SOURCE(SOURCE) (((SOURCE) == RCC_SYSCLKSource_HSI) || \
((SOURCE) == RCC_SYSCLKSource_HSE) || \
((SOURCE) == RCC_SYSCLKSource_PLLCLK))
/* AHB clock source */
/********RCC_CFGR时钟配置寄存器***********
第7：4位：HPRE AHB预分频
由软件置1或清0来控制AHB时钟的预分频系统
当AHB时钟的预分频系数大于1时，必须开启预取缓冲器。详见第2.3.3节
***************END**********************/
#define RCC_SYSCLK_Div1 ((u32)0x00000000)
#define RCC_SYSCLK_Div2 ((u32)0x00000080)
#define RCC_SYSCLK_Div4 ((u32)0x00000090)
#define RCC_SYSCLK_Div8 ((u32)0x000000A0)
#define RCC_SYSCLK_Div16 ((u32)0x000000B0)
#define RCC_SYSCLK_Div64 ((u32)0x000000C0)
#define RCC_SYSCLK_Div128 ((u32)0x000000D0)
#define RCC_SYSCLK_Div256 ((u32)0x000000E0)
#define RCC_SYSCLK_Div512 ((u32)0x000000F0)
#define IS_RCC_HCLK(HCLK) (((HCLK) == RCC_SYSCLK_Div1) || ((HCLK) == RCC_SYSCLK_Div2) || \
((HCLK) == RCC_SYSCLK_Div4) || ((HCLK) == RCC_SYSCLK_Div8) || \
((HCLK) == RCC_SYSCLK_Div16) || ((HCLK) == RCC_SYSCLK_Div64) || \
((HCLK) == RCC_SYSCLK_Div128) || ((HCLK) == RCC_SYSCLK_Div256) || \
((HCLK) == RCC_SYSCLK_Div512))
/* APB1/APB2 clock source */
/********RCC_CFGR时钟配置寄存器***********
第10：8位：低速APB预分频（APB1）
***************END**********************/
#define RCC_HCLK_Div1 ((u32)0x00000000)
#define RCC_HCLK_Div2 ((u32)0x00000400)
#define RCC_HCLK_Div4 ((u32)0x00000500)
#define RCC_HCLK_Div8 ((u32)0x00000600)
#define RCC_HCLK_Div16 ((u32)0x00000700)
#define IS_RCC_PCLK(PCLK) (((PCLK) == RCC_HCLK_Div1) || ((PCLK) == RCC_HCLK_Div2) || \
((PCLK) == RCC_HCLK_Div4) || ((PCLK) == RCC_HCLK_Div8) || \
((PCLK) == RCC_HCLK_Div16))
/* RCC Interrupt source */
//RCC_CIR时钟中断寄存器
#define RCC_IT_LSIRDY ((u8)0x01)
#define RCC_IT_LSERDY ((u8)0x02)
#define RCC_IT_HSIRDY ((u8)0x04)
#define RCC_IT_HSERDY ((u8)0x08)
#define RCC_IT_PLLRDY ((u8)0x10)
#define RCC_IT_CSS ((u8)0x80)
#define IS_RCC_IT(IT) ((((IT) & (u8)0xE0) == 0x00) && ((IT) != 0x00))
#define IS_RCC_GET_IT(IT) (((IT) == RCC_IT_LSIRDY) || ((IT) == RCC_IT_LSERDY) || \
((IT) == RCC_IT_HSIRDY) || ((IT) == RCC_IT_HSERDY) || \
((IT) == RCC_IT_PLLRDY) || ((IT) == RCC_IT_CSS))
#define IS_RCC_CLEAR_IT(IT) ((((IT) & (u8)0x60) == 0x00) && ((IT) != 0x00))
/* USB clock source */
#define RCC_USBCLKSource_PLLCLK_1Div5 ((u8)0x00)
#define RCC_USBCLKSource_PLLCLK_Div1 ((u8)0x01)
#define IS_RCC_USBCLK_SOURCE(SOURCE) (((SOURCE) == RCC_USBCLKSource_PLLCLK_1Div5) || \
((SOURCE) == RCC_USBCLKSource_PLLCLK_Div1))
/* ADC clock source */
#define RCC_PCLK2_Div2 ((u32)0x00000000)
#define RCC_PCLK2_Div4 ((u32)0x00004000)
#define RCC_PCLK2_Div6 ((u32)0x00008000)
#define RCC_PCLK2_Div8 ((u32)0x0000C000)
#define IS_RCC_ADCCLK(ADCCLK) (((ADCCLK) == RCC_PCLK2_Div2) || ((ADCCLK) == RCC_PCLK2_Div4) || \
((ADCCLK) == RCC_PCLK2_Div6) || ((ADCCLK) == RCC_PCLK2_Div8))
/* LSE configuration */
#define RCC_LSE_OFF ((u8)0x00)
#define RCC_LSE_ON ((u8)0x01)
#define RCC_LSE_Bypass ((u8)0x04)
#define IS_RCC_LSE(LSE) (((LSE) == RCC_LSE_OFF) || ((LSE) == RCC_LSE_ON) || \
((LSE) == RCC_LSE_Bypass))
/* RTC clock source */
#define RCC_RTCCLKSource_LSE ((u32)0x00000100)
#define RCC_RTCCLKSource_LSI ((u32)0x00000200)
#define RCC_RTCCLKSource_HSE_Div128 ((u32)0x00000300)
#define IS_RCC_RTCCLK_SOURCE(SOURCE) (((SOURCE) == RCC_RTCCLKSource_LSE) || \
((SOURCE) == RCC_RTCCLKSource_LSI) || \
((SOURCE) == RCC_RTCCLKSource_HSE_Div128))
/* AHB peripheral */
#define RCC_AHBPeriph_DMA1 ((u32)0x00000001)
#define RCC_AHBPeriph_DMA2 ((u32)0x00000002)
#define RCC_AHBPeriph_SRAM ((u32)0x00000004)
#define RCC_AHBPeriph_FLITF ((u32)0x00000010)
#define RCC_AHBPeriph_CRC ((u32)0x00000040)
#define RCC_AHBPeriph_FSMC ((u32)0x00000100)
#define RCC_AHBPeriph_SDIO ((u32)0x00000400)
#define IS_RCC_AHB_PERIPH(PERIPH) ((((PERIPH) & 0xFFFFFAA8) == 0x00) && ((PERIPH) != 0x00))
/* APB2 peripheral */
#define RCC_APB2Periph_AFIO ((u32)0x00000001)
#define RCC_APB2Periph_GPIOA ((u32)0x00000004)
#define RCC_APB2Periph_GPIOB ((u32)0x00000008)
#define RCC_APB2Periph_GPIOC ((u32)0x00000010)
#define RCC_APB2Periph_GPIOD ((u32)0x00000020)
#define RCC_APB2Periph_GPIOE ((u32)0x00000040)
#define RCC_APB2Periph_GPIOF ((u32)0x00000080)
#define RCC_APB2Periph_GPIOG ((u32)0x00000100)
#define RCC_APB2Periph_ADC1 ((u32)0x00000200)
#define RCC_APB2Periph_ADC2 ((u32)0x00000400)
#define RCC_APB2Periph_TIM1 ((u32)0x00000800)
#define RCC_APB2Periph_SPI1 ((u32)0x00001000)
#define RCC_APB2Periph_TIM8 ((u32)0x00002000)
#define RCC_APB2Periph_USART1 ((u32)0x00004000)
#define RCC_APB2Periph_ADC3 ((u32)0x00008000)
#define RCC_APB2Periph_ALL ((u32)0x0000FFFD)
#define IS_RCC_APB2_PERIPH(PERIPH) ((((PERIPH) & 0xFFFF0002) == 0x00) && ((PERIPH) != 0x00))
/* APB1 peripheral */
#define RCC_APB1Periph_TIM2 ((u32)0x00000001)
#define RCC_APB1Periph_TIM3 ((u32)0x00000002)
#define RCC_APB1Periph_TIM4 ((u32)0x00000004)
#define RCC_APB1Periph_TIM5 ((u32)0x00000008)
#define RCC_APB1Periph_TIM6 ((u32)0x00000010)
#define RCC_APB1Periph_TIM7 ((u32)0x00000020)
#define RCC_APB1Periph_WWDG ((u32)0x00000800)
#define RCC_APB1Periph_SPI2 ((u32)0x00004000)
#define RCC_APB1Periph_SPI3 ((u32)0x00008000)
#define RCC_APB1Periph_USART2 ((u32)0x00020000)
#define RCC_APB1Periph_USART3 ((u32)0x00040000)
#define RCC_APB1Periph_UART4 ((u32)0x00080000)
#define RCC_APB1Periph_UART5 ((u32)0x00100000)
#define RCC_APB1Periph_I2C1 ((u32)0x00200000)
#define RCC_APB1Periph_I2C2 ((u32)0x00400000)
#define RCC_APB1Periph_USB ((u32)0x00800000)
#define RCC_APB1Periph_CAN ((u32)0x02000000)
#define RCC_APB1Periph_BKP ((u32)0x08000000)
#define RCC_APB1Periph_PWR ((u32)0x10000000)
#define RCC_APB1Periph_DAC ((u32)0x20000000)
#define RCC_APB1Periph_ALL ((u32)0x3AFEC83F)
#define IS_RCC_APB1_PERIPH(PERIPH) ((((PERIPH) & 0xC50137C0) == 0x00) && ((PERIPH) != 0x00))
/* Clock source to output on MCO pin */
#define RCC_MCO_NoClock ((u8)0x00)
#define RCC_MCO_SYSCLK ((u8)0x04)
#define RCC_MCO_HSI ((u8)0x05)
#define RCC_MCO_HSE ((u8)0x06)
#define RCC_MCO_PLLCLK_Div2 ((u8)0x07)
#define IS_RCC_MCO(MCO) (((MCO) == RCC_MCO_NoClock) || ((MCO) == RCC_MCO_HSI) || \
((MCO) == RCC_MCO_SYSCLK) || ((MCO) == RCC_MCO_HSE) || \
((MCO) == RCC_MCO_PLLCLK_Div2))
/* RCC Flag */
#define RCC_FLAG_HSIRDY ((u8)0x20)
#define RCC_FLAG_HSERDY ((u8)0x31)
#define RCC_FLAG_PLLRDY ((u8)0x39)
#define RCC_FLAG_LSERDY ((u8)0x41)
#define RCC_FLAG_LSIRDY ((u8)0x61)
#define RCC_FLAG_PINRST ((u8)0x7A)
#define RCC_FLAG_PORRST ((u8)0x7B)
#define RCC_FLAG_SFTRST ((u8)0x7C)
#define RCC_FLAG_IWDGRST ((u8)0x7D)
#define RCC_FLAG_WWDGRST ((u8)0x7E)
#define RCC_FLAG_LPWRRST ((u8)0x7F)
#define IS_RCC_FLAG(FLAG) (((FLAG) == RCC_FLAG_HSIRDY) || ((FLAG) == RCC_FLAG_HSERDY) || \
((FLAG) == RCC_FLAG_PLLRDY) || ((FLAG) == RCC_FLAG_LSERDY) || \
((FLAG) == RCC_FLAG_LSIRDY) || ((FLAG) == RCC_FLAG_PINRST) || \
((FLAG) == RCC_FLAG_PORRST) || ((FLAG) == RCC_FLAG_SFTRST) || \
((FLAG) == RCC_FLAG_IWDGRST)|| ((FLAG) == RCC_FLAG_WWDGRST)|| \
((FLAG) == RCC_FLAG_LPWRRST))
#define IS_RCC_CALIBRATION_VALUE(VALUE) ((VALUE) <= 0x1F)
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
void RCC_DeInit(void);
void RCC_HSEConfig(u32 RCC_HSE);
ErrorStatus RCC_WaitForHSEStartUp(void);
void RCC_AdjustHSICalibrationValue(u8 HSICalibrationValue);
void RCC_HSICmd(FunctionalState NewState);
void RCC_PLLConfig(u32 RCC_PLLSource, u32 RCC_PLLMul);
void RCC_PLLCmd(FunctionalState NewState);
void RCC_SYSCLKConfig(u32 RCC_SYSCLKSource);
u8 RCC_GetSYSCLKSource(void);
void RCC_HCLKConfig(u32 RCC_SYSCLK);
void RCC_PCLK1Config(u32 RCC_HCLK);
void RCC_PCLK2Config(u32 RCC_HCLK);
void RCC_ITConfig(u8 RCC_IT, FunctionalState NewState);
void RCC_USBCLKConfig(u32 RCC_USBCLKSource);
void RCC_ADCCLKConfig(u32 RCC_PCLK2);
void RCC_LSEConfig(u8 RCC_LSE);
void RCC_LSICmd(FunctionalState NewState);
void RCC_RTCCLKConfig(u32 RCC_RTCCLKSource);
void RCC_RTCCLKCmd(FunctionalState NewState);
void RCC_GetClocksFreq(RCC_ClocksTypeDef* RCC_Clocks);
void RCC_AHBPeriphClockCmd(u32 RCC_AHBPeriph, FunctionalState NewState);
void RCC_APB2PeriphClockCmd(u32 RCC_APB2Periph, FunctionalState NewState);
void RCC_APB1PeriphClockCmd(u32 RCC_APB1Periph, FunctionalState NewState);
void RCC_APB2PeriphResetCmd(u32 RCC_APB2Periph, FunctionalState NewState);
void RCC_APB1PeriphResetCmd(u32 RCC_APB1Periph, FunctionalState NewState);
void RCC_BackupResetCmd(FunctionalState NewState);
void RCC_ClockSecuritySystemCmd(FunctionalState NewState);
void RCC_MCOConfig(u8 RCC_MCO);
FlagStatus RCC_GetFlagStatus(u8 RCC_FLAG);
void RCC_ClearFlag(void);
ITStatus RCC_GetITStatus(u8 RCC_IT);
void RCC_ClearITPendingBit(u8 RCC_IT);
#endif /* __STM32F10x_RCC_H */
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/