{"id":3519,"date":"2010-12-21T15:01:55","date_gmt":"2010-12-21T21:01:55","guid":{"rendered":"http:\/\/mightyohm.com\/blog\/?p=3519"},"modified":"2015-09-26T11:11:01","modified_gmt":"2015-09-26T18:11:01","slug":"issue-with-rescue-shield-and-targets-with-sut-0ms","status":"publish","type":"post","link":"https:\/\/mightyohm.com\/blog\/2010\/12\/issue-with-rescue-shield-and-targets-with-sut-0ms\/","title":{"rendered":"Issue with Rescue Shield and targets with SUT = 0ms"},"content":{"rendered":"

HV Rescue Shield 2.0<\/a> customer Matthew Beckler has uncovered an issue that affects all variants of the Rescue Shield.<\/p>\n

Long story short, if the target AVR is configured for a fast internal clock and zero\u00a0startup time (eg. LFUSE=0x62 on the ATtiny13A gives a 9.6MHz clock with 14CK +0ms startup delay), then a slow rising edge on the 12V RESET signal from the Shield results in the target not entering or dropping out of HVSP or HVPP mode. \u00a0The symptom is that regardless of the fuses stored on the target, the Rescue Shield fuse reads return 0xFF. \u00a0In addition, the fuses can’t be changed.<\/p>\n

I am currently investigating a solution. \u00a0There is more information about the issue and updates regarding debugging in the HV Rescue Shield support forum<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

HV Rescue Shield 2.0 customer Matthew Beckler has uncovered an issue that affects all variants of the Rescue Shield. Long story short, if the target AVR is configured for a fast internal clock and zero\u00a0startup time (eg. LFUSE=0x62 on the ATtiny13A gives a 9.6MHz clock with 14CK +0ms startup delay), then a slow rising edge … Continue reading Issue with Rescue Shield and targets with SUT = 0ms<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[10],"tags":[364],"class_list":["post-3519","post","type-post","status-publish","format-standard","hentry","category-microcontrollers","tag-hvrescue"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pioCd-UL","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":3620,"url":"https:\/\/mightyohm.com\/blog\/2011\/02\/hv-rescue-shield-2-1-now-shipping\/","url_meta":{"origin":3519,"position":0},"title":"HV Rescue Shield 2.1 Now Shipping","author":"Jeff","date":"February 7, 2011","format":false,"excerpt":"I have good news. \u00a0The latest and greatest version of the HV Rescue Shield is now available! Version 2.1 contains a new and improved 12V switching circuit that resolves an issue reading\/writing to parts with certain startup timer settings. \u00a0This issue affects all previous versions of the Rescue Shield kit.\u2026","rel":"","context":"In "Electronics"","block_context":{"text":"Electronics","link":"https:\/\/mightyohm.com\/blog\/category\/electronics\/"},"img":{"alt_text":"HV Rescue Shield 2.1","src":"https:\/\/i0.wp.com\/mightyohm.com\/files\/flickr\/5418114324_df1976bef0.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2530,"url":"https:\/\/mightyohm.com\/blog\/2009\/11\/minor-updates-to-avr-hv-rescue-shield\/","url_meta":{"origin":3519,"position":1},"title":"Minor updates to the AVR HV Rescue Shield","author":"Jeff","date":"November 3, 2009","format":false,"excerpt":"This week there have been a couple minor updates to the AVR HV Rescue Shield: I just uploaded version 1.1 of the Arduino sketch, which fixes an issue with garbage being printed in the serial monitor between burn cycles.\u00a0 I also made some minor changes to try to reduce the\u2026","rel":"","context":"In "Kits"","block_context":{"text":"Kits","link":"https:\/\/mightyohm.com\/blog\/category\/kits\/"},"img":{"alt_text":"AVR HV Rescue Shield with ATmega168 target ","src":"https:\/\/i0.wp.com\/www.mightyohm.com\/blog\/wp-content\/uploads\/2009\/03\/rescue-shield-with-atmega2_scaled-500x375.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":1419,"url":"https:\/\/mightyohm.com\/blog\/2009\/03\/introducing-the-avr-hv-rescue-shield\/","url_meta":{"origin":3519,"position":2},"title":"Introducing the AVR HV Rescue Shield","author":"Jeff","date":"March 11, 2009","format":false,"excerpt":"This all started last year, when I was playing with an ATmega168 microcontroller and did something silly.\u00a0 I programmed the RSTDISBL fuse bit, which effectively makes it impossible to reflash the chip using an ordinary (serial) programmer. Instead of giving up and throwing out the \"dead\" chip,\u00a0 I decided to\u2026","rel":"","context":"In "Electronics"","block_context":{"text":"Electronics","link":"https:\/\/mightyohm.com\/blog\/category\/electronics\/"},"img":{"alt_text":"AVR HV Rescue Shield with ATmega168 target ","src":"https:\/\/i0.wp.com\/mightyohm.com\/blog\/wp-content\/uploads\/2009\/03\/rescue-shield-with-atmega2_scaled-500x375.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":294,"url":"https:\/\/mightyohm.com\/blog\/2008\/09\/arduino-based-avr-high-voltage-programmer\/","url_meta":{"origin":3519,"position":3},"title":"Arduino-based AVR High Voltage Programmer","author":"Jeff","date":"September 24, 2008","format":false,"excerpt":"Update 01\/02\/09: A PCB version of this circuit is in the design stages - some preliminary information is here. Update 03\/11\/09: Kits based on this design are now for sale! Update 12\/14\/10: The original AVR HV Rescue Shield kit has been replaced by the new and improved HV Rescue Shield\u2026","rel":"","context":"In "Kits"","block_context":{"text":"Kits","link":"https:\/\/mightyohm.com\/blog\/category\/kits\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/mightyohm.com\/blog\/wp-content\/uploads\/2008\/09\/hvfuse_fixed.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/mightyohm.com\/blog\/wp-content\/uploads\/2008\/09\/hvfuse_fixed.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/mightyohm.com\/blog\/wp-content\/uploads\/2008\/09\/hvfuse_fixed.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/mightyohm.com\/blog\/wp-content\/uploads\/2008\/09\/hvfuse_fixed.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/mightyohm.com\/blog\/wp-content\/uploads\/2008\/09\/hvfuse_fixed.png?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":3543,"url":"https:\/\/mightyohm.com\/blog\/2011\/01\/hv-rescue-shield-2-0-status-update\/","url_meta":{"origin":3519,"position":4},"title":"HV Rescue Shield 2.0 status update","author":"Jeff","date":"January 12, 2011","format":false,"excerpt":"Just before the holidays, an issue with the Rescue Shield 2.0 (which I have at times referred to as \"2.x\") was identified. \u00a0The issue involves problems reading\/writing to parts that have certain startup timer (SUT) fuse values set. There is some more information about the issue on the forums and\u2026","rel":"","context":"In "Kits"","block_context":{"text":"Kits","link":"https:\/\/mightyohm.com\/blog\/category\/kits\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5599,"url":"https:\/\/mightyohm.com\/blog\/2014\/01\/rescue-your-bricked-avr-micro-with-the-rescue-shield-now-back-in-stock\/","url_meta":{"origin":3519,"position":5},"title":"Rescue your bricked AVR micro with the Rescue Shield, now back in stock!","author":"Jeff","date":"January 12, 2014","format":false,"excerpt":"Rescue Shield kits are (finally!) back in stock. The Rescue Shield is a 100% open source, Arduino-based high voltage mode fuse programmer for AVR microcontrollers. It allows you bring \u00a0an otherwise \"bricked\" or misconfigured AVR back to life by editing the configuration fuses that control the operation of the RESET\u2026","rel":"","context":"In "Kits"","block_context":{"text":"Kits","link":"https:\/\/mightyohm.com\/blog\/category\/kits\/"},"img":{"alt_text":"AVR HV Rescue Shield","src":"https:\/\/i0.wp.com\/mightyohm.com\/blog\/wp-content\/uploads\/2011\/12\/hvrescue21.jpg?resize=350%2C200","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/posts\/3519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/comments?post=3519"}],"version-history":[{"count":3,"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/posts\/3519\/revisions"}],"predecessor-version":[{"id":7810,"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/posts\/3519\/revisions\/7810"}],"wp:attachment":[{"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/media?parent=3519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/categories?post=3519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mightyohm.com\/blog\/wp-json\/wp\/v2\/tags?post=3519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}