实验1LED流水灯的设计实验目的：熟悉CCS54及DYFFTB6638实验箱。重点难点：LED流水灯的软件编程方法。一CCS介绍CodeComposerStudio是TI嵌入式处理器系列的IDE，可在Wi
dows和Li
uxPC上运行，用于TI器件的源码编译等功能二CCS的安装过程（略）三实验内容DYFFTB6638实验箱上3个LED定时翻转，实现闪烁效果。四LED流水灯的实验原理DYFFTB6638实验箱的LED硬件电路如下：
五设计参考代码1MSP430F6638_LED1cMSP430F6638DemoSoftwareToggleP4Descriptio
ToggleP4byxori
gP4i
sideofasoftwareloopACLK32768kHzMCLKSMCLKdefaultDCO1MHzMSP430F6638RSTP44LED_REDP45LED_GREENP46LED_YELLOW
fdefi
eP3P4_BASE_Addressdefi
eBIT4defi
eBIT5defi
eBIT6defi
eP4DIRdefi
eP4OUT
0x02200x00100x00200x0040
volatileu
sig
edcharP3P4_BASE_Address0x05volatileu
sig
edcharP3P4_BASE_Address0x03
voidmai
voidvolatileu
sig
edi
tiP4DIRBIT4BIT5BIT6while1P4OUTBIT4BIT5BIT6fori20000i0i2MSP430F6638_LED2cMSP430F6638DemoSoftwareToggleP4Descriptio
ToggleP4byxori
gP4i
sideofasoftwareloopACLK32768kHzMCLKSMCLKdefaultDCO1MHzMSP430F6638RSTP44LED_REDP45LED_GREENP46LED_YELLOWi
cludemsp430f6638hvoidmai
voidvolatileu
sig
edi
tiWDTCTLWDTPWWDTHOLDP4DIRBIT4BIT5BIT6while1StopWDTP44P45P46setasoutputco
ti
uousloopP44P45P46setasoutputco
ti
uousloopXORP44P45P46Delay
fP4OUTBIT4BIT5BIT6fori20000i0i六总结
XORP44P45P46Delay
对于同样的软件延时语句“fori20000i0i”，LED闪烁的频率，程序1MSP430F6638_LED1c大于2MSP430F6638_LED2c，具体原因？
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