37x时钟配置
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September 2012Doc ID 023352 Rev 11/16
AN4132
Application note
Clock configuration tool for STM32F37x/STM32F38x
microcontrollers
Introduction
This application note presents the clock system configuration tool for the STM32F37x and STM32F38x microcontroller families.
The purpose of this tool is to help the user to configure the microcontroller clocks, taking into consideration product parameters such as power supply and Flash access mode.
Note:
The clock configuration tool for STM32F37xx and STM32F38xx microcontrollers will be referred to as “STM32F37x clock configuration tool“ throughout the document. “STM32F37x“ will refer to STM32F37xx and STM32F38x.
The configuration tool is implemented in the “STM32F37x_Clock_Configuration_VX.Y .Z.xls” file which is supplied with the STM32F37x Standard Peripherals Library and can be downloaded from .
This tool supports the following functions for the STM32F37x:
●Configuration of the system clock, HCLK source and output frequency
●Configuration of the Flash latency (number of wait states depending on the HCLK frequency)
●Setting of the PCLK1, PCLK2, TIMCLK (timer clocks) and I2SCLK frequencies ●
Generation of a ready-to-use system_stm32f37x.c file with all the above settings
(STM32F37x CMSIS Cortex-M4 Device Peripheral Access Layer System Source File)
The STM32F37x_Clock_Configuration_VX.Y .Z.xls is referred to as “clock tool” throughout this document.
Before using the clock tool, it is essential to read the STM32F37x microcontroller reference manual (RM0313). This application note is not a substitute for the reference manual.This tool supports only the STM32F37x devices.
For VX.Y .Z, please refer to the tool version, example V1.0.0. Table 1 lists the microcontrollers concerned by this application note.
Table 1.
Applicable products
Type
Applicable products
Microcontrollers
STM32F37x STM32F38x
Contents AN4132
Contents
1Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1Software requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.2Clock scheme for STM32F37x microcontrollers . . . . . . . . . . . . . . . . . . . 6
2.2.3I2S clock generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3Tutorials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1Wizard mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2Expert mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4Known limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16Doc ID 023352 Rev 1