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Definition of "Mask ROM" |
A Read Only Memory IC that has been pre-programmed at the factor before the device was shipped. A ROM that has had a mask applied to it. Also refer to ROM IC Vendors. / Mask ROM (MROM) is a type of read-only memory (ROM) whose contents are programmed by the integrated circuit manufacturer (rather than by the user). The terminology "mask" comes from integrated circuit fabrication, where regions of the chip are masked off during the process of photolithography.It is common practice to use rewritable non-volatile memory such as UV-EPROM or EEPROM for the development phase of a project, and to switch to mask ROM when the code has been finalized. For example, Atmel microcontrollers come in both EEPROM and mask ROM formats. |
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