Description: 在上述程序中，定义了一个无符号字符变量contr_led，长度为1个字节，其最低两位用来表示RD0和RD1引脚对左、右转向灯的控制状态。 语句“contr_led=PORTD ”将PORTD口的8个引脚状态保存到变量contr_led中，再执行“与”操作语句“contr_led= contr_led&0x03 ”，把无关位清零，一般称之屏蔽。然后，采用switch(contr_led)语句来判断变量contr_led的值与哪个case语句中的常量表达式的值相同，点亮相应的转向灯；如果都不相等，则执行default后的语句。
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Protel99的元件库&封装库
.......................\Actel.ddb
.......................\Allegro.ddb
.......................\Altera.ddb
.......................\AMP.ddb
.......................\Analog Devices.ddb
.......................\Atmel.ddb
.......................\Backup of PCB1.PCB
.......................\Backup of PCBLIB1.LIB
.......................\Backup of Sheet1.Sch
.......................\Backup of 电工.lib
.......................\Burr-Brown.ddb
.......................\Dallas.ddb
.......................\Elantec.ddb
.......................\Fairchild Semiconductor.ddb
.......................\General Components.ddb
.......................\Gennum.ddb
.......................\Harris.ddb
.......................\Infineon.ddb
.......................\International Rectifier.ddb
.......................\Intersil.ddb
.......................\Lattice Semiconductor.ddb
.......................\Linear Technology.ddb
.......................\Maxim.ddb
.......................\Microchip.ddb
.......................\Miscellaneous Devices.ddb
.......................\Mitel.ddb
.......................\Motorola.ddb
.......................\MyDesign.ddb
.......................\National Semiconductor.ddb
.......................\NEC.ddb
.......................\Newport.ddb
.......................\pcb
.......................\...\avr_protel.lib
.......................\...\Backup of avr_protel.lib
.......................\...\Backup of 常用元件封裝庫(pcb).Lib
.......................\...\Backup of 杂元件库.lib
.......................\...\Backup of 电工.lib
.......................\...\msp430flash.lib
.......................\...\Previous Backup of 常用元件封裝庫(pcb).Lib
.......................\...\Previous Backup of 电工.lib
.......................\...\常用元件封裝庫(pcb).Lib
.......................\Previous Backup of PCB1.PCB
.......................\Previous Backup of PCBLIB1.LIB
.......................\Previous Backup of Sheet1.Sch
.......................\Previous Backup of 电工.lib
.......................\Protel常用元件库
.......................\................\常用库元件.ddb
.......................\Protel常用封装库
.......................\................\复件 Advpcb.ddb
.......................\................\常用零件1.ddb
.......................\................\通用封装.ddb
.......................\QA Footprint Libraries.ddb
.......................\QuickLogic.ddb
.......................\Raltron Electronics.ddb
.......................\RF Microdevices.ddb
.......................\Sim.ddb
.......................\ST-Microelectronics.ddb
.......................\Teccor.ddb
.......................\Texas Instruments.ddb
.......................\Toshiba.ddb
.......................\Vishay Lite-On.ddb
.......................\Vishay Siliconix.ddb
.......................\Vishay Telefunken.ddb
.......................\Western Digital.ddb
.......................\Zetex.ddb
.......................\元件库
.......................\......\a-d
.......................\......\...\Actel_001112000.zip
.......................\......\...\Allegro_003102000.zip
.......................\......\...\Altera_060012001.zip
.......................\......\...\AMP_001062001.zip
.......................\......\...\AnalogDevices_007082001.zip
.......................\......\...\Atmel.ddb
.......................\......\...\BurrBrown_006092000.zip
.......................\......\...\Dallas_001102000.zip
.......................\......\e-n
.......................\......\...\Elantec_005072000.zip
.......................\......\...\FairchildSemiconductor_006072000.zip
.......................\......\...\GeneralComponents_003062001.zip
.......................\......\...\Gennum_001082001.zip
.......................\......\...\Harris_003092000.zip
.......................\......\...\Infineon.zip
.......................\......\...\InternationalRectifier_003082001.zip
.......................\......\...\Intersil_004072000.zip
.......................\......\...\LatticeSemiconductor.zip
.......................\......\...\LinearTechnology_007062001.zip
.......................\......\...\Maxim_014092001.zip
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