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V
volatile（动态）
A value that may change without the intervention of software is said to be volatile. For example, values within the registers of some I/O devices may change in response to external events. C"s volatile keyword should be used to warn your compiler about any pointers that point to such registers. This will ensure that the actual value is reread each time the data is used.
一个可能不需要软件的的干涉就可改变的值被叫作动态。例如：在一些I/O设备的寄存器的值可能在响应外部事件时被改变。C语言中的volatile关键字被用来警告你的编译器那是一个指向一些寄存器的指针，请不要优化它。这个将确认在数据使用中的每一时间实际的值是要重新读入的。
W
watchdog timer（看门狗定时器）
A hardware timer that is periodically reset by software. If the software crashesor hangs, the watchdog timer will expire, and the entire system will be reset automatically.
一种由软件定时重设的硬件定时器。如果软件被破坏而挂起，看门狗定时器将超时，整个系统将自动重启。
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volatile（动态）
A value that may change without the intervention of software is said to be volatile. For example, values within the registers of some I/O devices may change in response to external events. C"s volatile keyword should be used to warn your compiler about any pointers that point to such registers. This will ensure that the actual value is reread each time the data is used.
一个可能不需要软件的的干涉就可改变的值被叫作动态。例如：在一些I/O设备的寄存器的值可能在响应外部事件时被改变。C语言中的volatile关键字被用来警告你的编译器那是一个指向一些寄存器的指针，请不要优化它。这个将确认在数据使用中的每一时间实际的值是要重新读入的。
W
watchdog timer（看门狗定时器）
A hardware timer that is periodically reset by software. If the software crashesor hangs, the watchdog timer will expire, and the entire system will be reset automatically.
一种由软件定时重设的硬件定时器。如果软件被破坏而挂起，看门狗定时器将超时，整个系统将自动重启。