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The third-generation Flash microcontrollers from Atmel are now available. These microcontrollers offer self-programming Flash. The microcontroller can write to its own program memory when running code from the boot sector. This creates new possibilities for the designers using self-programming memory-based microcontrollers. Atmel’s microcontrollers with integrated Flash program memory provide increased system flexibility by enabling field programmability, data storage and remote upgrades. The size of the boot block of the Atmel megaAVR series of microcontrollers is programmable between 256 bytes and 4 Kbytes. The smaller sizes are utilized when a simple self-programming scheme is used. The larger boot block sizes give the users the possibility for adding encryption/decryption algorithms. The DES algorithm will fit into a 2-Kbyte boot block in an AVR microcontroller. Self-programming memory simplifies and cost reduces designs that require software upgrade after the system has been installed. In the past, this function required the use of a second microcontroller, which was used to control reprogramming and to maintain critical functions during programming.
Tags : avr microcontroller, decryption algorithms, self programming, flash microcontrollers, system flexibility, program memory, boot block, flash program, programming content, critical functions, boot sector, atmel, kbyte, data storage, third generation
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