/******************************************************************************
?*?@file:????system_LPC17xx.c
?*?@purpose:?CMSIS?Cortex-M3?Device?Peripheral?Access?layer?Source?File
?*???????????for?the?NXP?LPC17xx?Device?Series?
?*?@version:?V1.6
?*?@date:????12th?February?2010
?*----------------------------------------------------------------------------
?*
?*?Copyright?（C）?2008?ARM?Limited.?All?rights?reserved.
?*
?*?ARM?Limited?（ARM）?is?supplying?this?software?for?use?with?Cortex-M3?
?*?processor?based?microcontrollers.??This?file?can?be?freely?distributed?
?*?within?development?tools?that?are?supporting?such?ARM?based?processors.?
?*
?*?THIS?SOFTWARE?IS?PROVIDED?“AS?IS“.??NO?WARRANTIES?WHETHER?EXPRESS?IMPLIED
?*?OR?STATUTORY?INCLUDING?BUT?NOT?LIMITED?TO?IMPLIED?WARRANTIES?OF
?*?MERCHANTABILITY?AND?FITNESS?FOR?A?PARTICULAR?PURPOSE?APPLY?TO?THIS?SOFTWARE.
?*?ARM?SHALL?NOT?IN?ANY?CIRCUMSTANCES?BE?LIABLE?FOR?SPECIAL?INCIDENTAL?OR
?*?CONSEQUENTIAL?DAMAGES?FOR?ANY?REASON?WHATSOEVER.
?*
?******************************************************************************/


#include?
#include?“LPC17xx.h“

/*
//--------?<<>>?------------------
*/

/*---------------------?Clock?Configuration?----------------------------------
//
//??Clock?Configuration
//????System?Controls?and?Status?Register?（SCS）
//?????????OSCRANGE:?Main?Oscillator?Range?Select
//?????????????????????<0=>??1?MHz?to?20?MHz
//?????????????????????<1=>?15?MHz?to?24?MHz
//????????????OSCEN:?Main?Oscillator?Enable
//?????
//???
//
//????Clock?Source?Select?Register?（CLKSRCSEL）
//????????CLKSRC:?PLL?Clock?Source?Selection
//?????????????????????<0=>?Internal?RC?oscillator
//?????????????????????<1=>?Main?oscillator
//?????????????????????<2=>?RTC?oscillator
//???
//
//????PLL0?Configuration?（Main?PLL）
//??????PLL0?Configuration?Register?（PLL0CFG）
//??????????????????????F_cco0?=?（2?*?M?*?F_in）?/?N
//??????????????????????F_in?must?be?in?the?range?of?32?kHz?to?50?MHz
//??????????????????????F_cco0?must?be?in?the?range?of?275?MHz?to?550?MHz
//?????????MSEL:?PLL?Multiplier?Selection
//?????????????????????<6-32768><#-1>
//??????????????????????M?Value
//????????NSEL:?PLL?Divider?Selection
//?????????????????????<1-256><#-1>
//??????????????????????N?Value
//?????
//???
//
//????PLL1?Configuration?（USB?PLL）
//??????PLL1?Configuration?Register?（PLL1CFG）
//??????????????????????F_usb?=?M?*?F_osc?or?F_usb?=?F_cco1?/?（2?*?P）
//??????????????????????F_cco1?=?F_osc?*?M?*?2?*?P
//??????????????????????F_cco1?must?be?in?the?range?of?156?MHz?to?320?MHz
//??????????MSEL:?PLL?Multiplier?Selection
//?????????????????????<1-32><#-1>
//??????????????????????M?Value?（for?USB?maximum?value?is?4）
//??????????PSEL:?PLL?Divider?Selection
//??????????????