Allowing end users to upgrade their products for bug fixes or feature enhancements is a desirable feature from both a marketing and engineering perspective. enCoRe™ II, as a Flash-based microcontroller, has the potential to allow firmware upgrades in the field via the USB protocol. However, firmware assistance is required to manage the download of the new code from the USB host, re-program the Flash, and re-start operation under the new code. This application note describes a bootloader for the low-speed USB enCoRe II device to implement this capability.
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