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Using nonvolatile memory in processors

Posted: 12 Mar 2009     Print Version  Bookmark and Share

Keywords:nonvolatile data storage  serial EEPROM  MAXQ microcontrollers 

Applications that require nonvolatile data storage almost always use an external serial EEPROM. This article by Maxim describes how to provide nonvolatile data storage by using only the flash memory already available in MAXQ microcontrollers.

Most applications that require a microcontroller also require some mechanism to store settings that will be remembered even when power is removed. A radio, for example, that forgets its station presets when the battery is changed will not be successful in today's marketplace. Customers expect favourite stations, temperature presets, preferences, and other persistent information to be saved from one use to the next.

To meet this customer expectation for nonvolatile data storage, designers traditionally use a serial EEPROM. These EEPROM devices are small, inexpensive, and have a long history that makes the design engineer comfortable with their use. But in today's cost-sensitive marketplace, adding even an inexpensive EEPROM device to a design can break the budget.

View the PDF document for more information.

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