ROM（只讀存儲器）
Read-Only Memory. A broad classification of memory devices that includes all devices in which the individual memory locations may be read, but not written.
只讀存儲器。一個包括所的的每個地址只能被讀，不能被寫的存儲器的大概分類。

ROM emulator（ROM模擬器）
A debugging tool that takes the place of-or emulates-the ROM on your target board. A ROM emulator acts very much like a debug monitor, except that it includes its own serial or network connection to the host.
一種在你的目標板上代替或模擬ROM的調試工具。ROM模擬器動作起來象一個除錯監視器，除了它包含自己連到主機上的串口或網絡外。

ROM monitor
See debug monitor.

RTOS（實時操作系統）
Real-Time Operating System. An operating system designed specifically for use in real-time systems.
實時操作系統。一種被特殊設計來用在實時系統中的操作系統。

race condition（競爭狀態）
A situation in which the outcome of a program may be affected by the exact order in which the instructions are executed. Race conditions are only an issue where interrupts and/or preemption are possible and where critical sections exist.
一種程序運行的結果可能被指令執行的順序影響的情形。競爭狀態僅僅有一種情況下產生，在此處中斷或（和）優先搶占是充許的并且有一個臨界區存在。

real-time system（實時系統）
Any computer system, embedded or otherwise, that has deadlines. The following question can be used to distinguish real-time systems from the rest: "Is a late answer as bad, or even worse, than a wrong answer?" In other words, what happens if the computation doesn"t finish in time? If nothing bad happens, it"s not a real-time system. If someone dies or the mission fails, it"s generally considered "hard" real-time, which is meant to imply that the system has "hard" deadlines. Everything in between is "soft" real-time.
    任何計算機系統，嵌入的或其他的，有一個死線。以下的問題可經被用來區分實時系統與其他的系統：“是遲到的回答壞，還是一個錯誤的回答壞？”換句話說，如果計算機沒有在指定時間內完成它的工作會發生什么？如果什么也沒有發生，它不是一個實時系統。如果一些人死或任務失敗，它被認為是“硬”實時系統，意思是系統有一個“硬”死線。介于兩者之間的是“軟”實時系統。

Recursive（遞歸）
Said of software that calls itself. Recursion should generally be avoided in an embedded system, since it frequently requires a large stack.
自己調用自己的程序的說法。遞歸一般在嵌入式系統中是不充許的，因為它常常占有大量的堆棧空間。

Reentrant（可再入的）
Said of software that can be executed multiple times simultaneously. A reentrant function can be safely called recursively or from multiple tasks. The key to making code reentrant is to ensure mutual exclusion whenever accessing global variables or shared registers.
可同時多次運行的程序的說法。可再入的函數可以被安全地遞歸調用或由多任務多次調用。使代碼可再入的關鍵在于確保在訪問全局變量或共享寄存器時互斥現象發生。

Register（寄存器）
A memory location that is part of a processor or an I/O device. In other words, it"s not normal memory. Generally, each bit or set of bits within the register controls some behavior of the larger device.
是處理器或I/O設備一部分的儲存器的地址。換句話說，不是標準的儲存器。一般地，在寄存器控制每一二進制位或二進制位的集控制大量設備的一些行為。

Relocatable（可重定位的）
A file containing object code that is almost ready for execution on the target. The final step is to use a locator to fix the remaining relocatable addresses within the code. The result of that process is an executable.
包含幾乎可以準備好在目標機上運行的目標代碼的文件。最后一步是使用定位程序去整理保留在代碼中的可重定位地址。這個步驟的結果是一個可執行的程序。本文由容源電子網（www.mnu8.com）整理提供，部分內容來源于網絡，如有侵犯到你的權利請與我們聯系更正。