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Mask ROM is a type of read-only memory.
掩模只读存储器是一种只读存储器。
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The mask-programmed read only memory of the microcontroller is integrated into the microcontroller and programmed once and for all during manufacture of the microcontroller.
单片机的掩模 ROM 集成到单片机中，并在生产单片机时一次性编程写入。
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