/**
??******************************************************************************
??*?@file????system_stm32g0xx.c
??*?@author??MCD?Application?Team
??*?@brief???CMSIS?Cortex-M0+?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_stm32g0xx.s“?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?HSI?（8?MHz?then?16?MHz）?is?used?as?system?clock?source.
??*???Then?SystemInit（）?function?is?called?in?“startup_stm32g0xx.s“?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）?????????????????????????????|?16000000
??*-----------------------------------------------------------------------------
??*????????HCLK（Hz）???????????????????????????????|?16000000
??*-----------------------------------------------------------------------------
??*????????AHB?Prescaler??????????????????????????|?1
??*-----------------------------------------------------------------------------
??*????????APB?Prescaler??????????????????????????|?1
??*-----------------------------------------------------------------------------
??*????????HSI?Division?factor????????????????????|?1
??*-----------------------------------------------------------------------------
??*????????PLL_M??????????????????????????????????|?1
??*-----------------------------------------------------------------------------
??*????????PLL_N??????????????????????????????????|?8
??*-----------------------------------------------------------------------------
??*????????PLL_P??????????????????????????????????|?7
??*-----------------------------------------------------------------------------
??*????????PLL_Q??????????????????????????????????|?2
??*-----------------------------------------------------------------------------
??*????????PLL_R??????????????????????????????????|?2
??*------------------------------------

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2019-05-10?01:17??New?Folder\
?????文件????????7538??2019-05-09?23:27??New?Folder\.mxproject
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\Device\
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\Device\ST\
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\
?????文件??????564041??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\stm32g030xx.h
?????文件??????607121??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\stm32g031xx.h
?????文件??????628876??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\stm32g041xx.h
?????文件??????583849??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\stm32g070xx.h
?????文件??????706743??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\stm32g071xx.h
?????文件??????728498??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\stm32g081xx.h
?????文件????????5122??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\stm32g0xx.h
?????文件????????2507??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Include\system_stm32g0xx.h
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\arm\
?????文件????????9755??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\arm\startup_stm32g030xx.s
?????文件???????10172??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\arm\startup_stm32g031xx.s
?????文件???????10255??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\arm\startup_stm32g041xx.s
?????文件????????9941??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\arm\startup_stm32g070xx.s
?????文件???????10425??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\arm\startup_stm32g071xx.s
?????文件???????10575??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\arm\startup_stm32g081xx.s
?????目錄???????????0??2019-05-09?23:02??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\gcc\
?????文件????????9065??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\gcc\startup_stm32g030xx.s
?????文件????????9546??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\gcc\startup_stm32g031xx.s
?????文件????????9708??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\gcc\startup_stm32g041xx.s
?????文件????????9387??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\gcc\startup_stm32g070xx.s
?????文件????????9843??2019-05-05?14:33??New?Folder\Drivers\CMSIS\Device\ST\STM32G0xx\Source\Templates\gcc\startup_stm32g071xx.s
............此處省略505個文件信息