/**
??******************************************************************************
??*?@file????system_stm32l1xx.c
??*?@author??MCD?Application?Team
??*?@version?V1.1.1
??*?@date????09-March-2012
??*?@brief???CMSIS?Cortex-M3?Device?Peripheral?Access?layer?System?Source?File.
??*??????????This?file?contains?the?system?clock?configuration?for?STM32L1xx?Ultra
??*??????????Low?Power?devices?and?is?generated?by?the?clock?configuration
??*??????????tool?“STM32L1xx_Clock_Configuration_V1.1.0.xls“.
??*?????????????
??*?1.??This?file?provides?two?functions?and?one?global?variable?to?be?called?from?
??*?????user?application:
??*??????-?SystemInit（）:?Setups?the?system?clock?（System?clock?source?PLL?Multiplier
??*??????????????????????and?Divider?factors?AHB/APBx?prescalers?and?Flash?settings）
??*??????????????????????depending?on?the?configuration?made?in?the?clock?xls?tool.?
??*??????????????????????This?function?is?called?at?startup?just?after?reset?and?
??*??????????????????????before?branch?to?main?program.?This?call?is?made?inside
??*??????????????????????the?“startup_stm32l1xx_xx.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.???
??*??????
??*?2.?After?each?device?reset?the?MSI?（2.1?MHz?Range）?is?used?as?system?clock?source.
??*????Then?SystemInit（）?function?is?called?in?“startup_stm32l1xx_xx.s“?file?to
??*????configure?the?system?clock?before?to?branch?to?main?program.????
??*????
??*?3.?If?the?system?clock?source?selected?by?user?fails?to?startup?the?SystemInit（）
??*????function?will?do?nothing?and?MSI?still?used?as?system?clock?source.?User?can?
??*????add?some?code?to?deal?with?this?issue?inside?the?SetSysClock（）?function.
??*?
??*?4.?The?default?value?of?HSE?crystal?is?set?to?8MHz?refer?to?“HSE_VALUE“?define
??*????in?“stm32l1xx.h“?file.?When?HSE?is?used?as?system?clock?source?directly?or
??*????through?PLL?and?you?are?using?different?crystal?you?have?to?adapt?the?HSE
??*????value?to?your?own?configuration.
??*?
??*?5.?This?file?configures?the?system?clock?as?follows:??
??*=============================================================================
??*?????????????????????????System?Clock?Configuration
??*=============================================================================
??*????????System?Clock?source??????????|?PLL（HSE）
??*-----------------------------------------------------------------------------
??*????????SYSCLK???????????????????????|?32000000?Hz
??*---------------------------------

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????51511??2012-01-03?14:11??lowpowertest\待機測試\Libraries\CMSIS\CMSIS?END?USER?LICENCE?AGREEMENT.pdf

?????文件?????475347??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Include\stm32l1xx.h

?????文件???????2220??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Include\system_stm32l1xx.h

?????文件??????20735??2012-03-09?10:34??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Release_Notes.html

?????文件??????14803??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\arm\startup_stm32l1xx_hd.s

?????文件??????13020??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\arm\startup_stm32l1xx_md.s

?????文件??????14559??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\arm\startup_stm32l1xx_mdp.s

?????文件??????11998??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\gcc_ride7\startup_stm32l1xx_hd.s

?????文件??????10669??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\gcc_ride7\startup_stm32l1xx_md.s

?????文件??????11745??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\gcc_ride7\startup_stm32l1xx_mdp.s

?????文件??????16631??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\iar\startup_stm32l1xx_hd.s

?????文件??????14178??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\iar\startup_stm32l1xx_md.s

?????文件??????16054??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\iar\startup_stm32l1xx_mdp.s

?????文件??????20175??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\system_stm32l1xx.c

?????文件???????3686??2012-02-08?19:12??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\TASKING\cstart_thumb2.asm

?????文件??????12064??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\TrueSTUDIO\startup_stm32l1xx_hd.s

?????文件??????10737??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\TrueSTUDIO\startup_stm32l1xx_md.s

?????文件??????11806??2012-03-09?10:33??lowpowertest\待機測試\Libraries\CMSIS\Device\ST\STM32L1xx\Source\Templates\TrueSTUDIO\startup_stm32l1xx_mdp.s

?????文件??????13643??2011-07-29?14:50??lowpowertest\待機測試\Libraries\CMSIS\Documentation\CMSIS-SVD_Schema_1_0.xsd

?????文件?????127419??2011-07-26?10:34??lowpowertest\待機測試\Libraries\CMSIS\Documentation\CMSIS_CM4_SIMD.htm

?????文件??????65406??2011-07-26?10:34??lowpowertest\待機測試\Libraries\CMSIS\Documentation\CMSIS_Core.htm

?????文件???????9956??2011-07-27?09:27??lowpowertest\待機測試\Libraries\CMSIS\Documentation\CMSIS_DebugSupport.htm

?????文件??????17863??2011-07-27?08:48??lowpowertest\待機測試\Libraries\CMSIS\Documentation\CMSIS_History.htm

?????文件?????123676??2011-07-26?10:34??lowpowertest\待機測試\Libraries\CMSIS\Documentation\CMSIS_Logo_Final.jpg

?????文件??????67286??2011-07-27?09:43??lowpowertest\待機測試\Libraries\CMSIS\Documentation\CMSIS_System_View_Description.htm

?????文件???????1120??2012-01-03?14:11??lowpowertest\待機測試\Libraries\CMSIS\Include\arm_common_tables.h

?????文件?????240326??2012-01-03?14:11??lowpowertest\待機測試\Libraries\CMSIS\Include\arm_math.h

?????文件??????31948??2012-01-03?14:11??lowpowertest\待機測試\Libraries\CMSIS\Include\core_cm0.h

?????文件??????69722??2012-01-03?14:11??lowpowertest\待機測試\Libraries\CMSIS\Include\core_cm3.h

?????文件??????79281??2012-01-03?14:11??lowpowertest\待機測試\Libraries\CMSIS\Include\core_cm4.h

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