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This application note is a step by step guide for setting up an easy FDX client application in C# .NET that interfaces to CANoe via FDX. CANoe FDX (Fast Data eXchange) is a UDP-based protocol for simple, fast and real-time exchange of data between CANoe and other systems via an Ethernet connection. This protocol grants other systems both read and write access to CANoe system and environment variables, and bus signals. The other system may be, for example, a HIL system on a test bench or a PC used to display CANoe data.

CANoe FDX 协议手册 CANoe FDX (Fast Data eXchange) is a protocol for simple, fast, real-time exchange of data between CANoe and other systems via an Ethernet connection. The protocol enables other systems read and write access to CANoe system variables, environment variables and contents of bus messages.

There are two fundamental problems of many modern microprocessor applications:
A task must be executed within a relatively short time frame.
Several tasks are time- and logic independent from one another and should therefore execute simultaneously on a processor. The first item is also referred to as a requirement for guaranteed response times, also designated as "real-time". The second item designates the typical situation of multi-program operation (multiprogramming, multi-tasking). In this case, the individual tasks are organized as independent computer processes (normally designated as a "task"). The RTX-51 Real-Time Multitasking Executive contains the functions to solve these types of problem definitions in a simple and effective way with all processors of the 8051 processor family. The sequence control required for simple applications could, of course, be implemented by the user himself. This, however, is not very efficient, since a large part of the functions which a multitasking executive already offers would have to be re-implemented.

P89V51RD2具有一个可编程的看门狗定时器（WDT），可用于系统故障安全保护，防止软件死锁和自动恢复。WDT在CPU落入软件运行失控的情况下可作为一种恢复的方法。P89V51RD2有两个特殊功能寄存器WDTC（地址0xC0）和WDTD（地址0x85）用于看门狗功能，有关这两个寄存器的详细注解参见《P89V51RD2器件手册》，http://www.zlgmcu.com。 WDT的溢出周期可由下式计算得出： T =（255 – WDTD）﹡344064*1/fOSC，此处WDTD为WDTD寄存器的装载值，fOSC是系统时钟。每经过344, 064个振荡周期，WDT寄存器加1。 当向WDTD装载0值时看门狗获得最大的溢出周期7.90s；当向WDTD装载0xFE时看门狗获得最小的溢出周期31.11ms；表1给出当fOSC为11.0592M时不同溢出周期对应的WDTD装载值的简表。若使用其它的晶振或想得到其它的溢出周期可根据公式自行计算。 。 。 。 。 。 。

STC51系列芯片在keil选择的补丁。。。。