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MCS—51单片机的所有指令中,有一些完成得比较快,只要一个机器周期就行了,有一些完成得比较馒,得要2个机器周期,还有两条指令要4个机器周期才行。为了衡量指令执行时间的长短,又引入一个新的概念:指令周期。所谓指令周期就是指执行一条指令的时间。例如,当需要计算DJNZ指令完成所需要的时间时,首先要知道晶振的频率,设所用晶振为12MHz,则一个机器周期就是1us。而DJNZ指令是双周期指令,所以执行一次要2us。如果该指令需要执行500次,正好1000us,也就是1ms。 机器周期不仅对于指令执打有着重要的意义,而且机器周期也是单片机定时器和计数器的时间基准。例如一个单片机选择了12MHz晶振,那么当定时器的数值加1时,实际经过的时间就是1us,这就是单片机的定时原理。PULNIX TM-7EX CAMERA
PROFACE QPK2D100L2P QUICK PANEL TOUCH SCREEN
PROFACE GP230-SC11 DIGITAL DISPLAY PANEL
SICK HALTERUNG WAND/TISCH F 6028227 HOLDER
QUICK PANEL MINI CQPM3D200B2P-A / 288.0052-01 DISPLAY PANEL
PROFACE 3180053-02 / ST400-041-24V DIGITAL PANEL
PROFACE 2980070-02 / GP 2300-TC41-24V TOUCH SCREEN HMI GRAPHIC PANEL
PATLITE GSL-505-K GRAPHIC DISPLAY PANEL
PASIFIC SCIENTIFIC R46SSNA-SS-NS-NV-02 BRUSHLESS ERVO
PARKER KURODA PRN10S-180-90 ROTARY CYLINDER
PARKER KURODA N413MDV244RL ORIGINAL REPLACEMENT PART
PARKER COMPUMOTOR SERVO DRIVE TQ10X CONTROLLER INDEXER
PARKER COMPUMOTOR S6 DRIVER
PARKER 47(A)-RL4A-EPRT-SS-MN-KD VALVE
PANASONIC MSM5AZA1Q AC SERVO MOTOR
PANASONIC MSDA023A1A AC SERVO DRIVER
PANASONIC MSD023A1XXK AC SERVO DRIVER
POLYPHASER EQUIPMENT UHF50HN
SMC CDRA1LS50-190C-A53 ROTARY CYLINDER
SMC EMSQB50R ROTARY CYLINDER
SMC MSQB30A-F9PL-XN ROTARY CYLINDER RACK&PINION TYPE CYLINDER
SMC MSQB30L2-A93 ROTARY CYLINDER
SMC MSQB50A ROTARY CYLINDER
SMC MSQB50R-F9N ROTARY CYLINDER
SMC MSQB70R-XN ROTARY CYLINDER
SMC MXH10-40 SLIDE CYLINDER
SMC MXH10-5 SLIDE CYLINDER
TOSOK OX 3285 BALL SCREW
TOSOK BALL SCREW L: 190MM (1 LOT 2 PCS)
TOSOK 9Z244 (1 LOT 2 PCS) ACTUATOR
TOSHIBA IK-M41MA CCD CAMERA CONTROLLER
THOMSON SUPER 12-0PN BALL BUSHING
THOMPSON SUPERSLIDE ACTUATOR
THK VRT 3055 BALL SLIDE
THK VRO-2035 LINEAR SLIDE
THK SC40UU LM CASE UNIT
THK RSR25A1UU LINEAR BLOCK
THK RSR 15ZM LINEAR SLIDE 2 BLOCK L : 310MM
THK L.S.P 2050 SLIPLESS BALL SLIDE
THK L.S.P 1340 SLIPLESS BALL SLDE
THK KR3310D+400 LM GUIDE ACTUATOR
THK KR-33A ACTUATOR L : 270MM
THK KR-33 LINEAR ACTUATOR L:230MM
THK KR-26 ACTUATOR CARRY WITH MOTOR & SOLENOID
THK KR 46 L:740MM
THK KR 33 LM GUIDE ACTUATOR L:325MM
THK KR 20 LINEAR ACTUATOR (OVER LENGTH : 135MM )
THK HSR8PM LINEAR BALL SLIDE L:34.61MM
THK GL15B+750L ACTUATOR L:1168MM
THK BTK2010A BALL SCREW L:580MM
THK BTK-1405A / PK545AWM BALL SCREW ACTUATOR & MOTOR (OVER LENGTH : 405MM)
THK BALL SCREW & NB PILLOW BLOCK
THK ACTUATOR KR46 -R2AA06020FXHOO SANYO DENKI (DRIVER RS1L03AA AND THK ACTUATOR
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