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AVR microcontrollers
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=== High-voltage serial === High-voltage serial programming (HVSP)<ref>{{cite web|url=http://support.atmel.no/knowledgebase/avrstudiohelp/mergedProjects/AVRDragon/AVRDragon_HVSP_Description.htm|title=HVSP_Description|publisher=Support.atmel.no|url-status=dead|archive-url=https://web.archive.org/web/20091012094540/http://support.atmel.no/knowledgebase/avrstudiohelp/mergedProjects/AVRDragon/AVRDragon_HVSP_Description.htm|archive-date=2009-10-12|access-date=2012-09-19}}</ref> is mostly the backup mode on smaller AVRs. An 8-pin AVR package does not leave many unique signal combinations to place the AVR into a programming mode. A 12-volt signal, however, is something the AVR should only see during programming and never during normal operation. The high voltage mode can also be used in some devices where the reset pin was disabled by fuses.
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