avr and locked - results edaboard.com

locked atmega ...

is it possible to reset or do something with locked atmega 8. what i mean by locked is that while programming something happened and chip got locked. now i cant erase it, reprogram it or do anything with it. well at least not with standard isp progra...
Microcontrollers :: 08 Nov 2009 13:10 :: ctownsend :: Replies: 85 :: Views: 12004

avr atmega32

i am using an atmega32. everything was ok until today, i could not program it on any computer. i am using a stk 200/300 programmer. i checked it. its ok. i have used other programmers and they didnt work as well. the thing is the ground wire in my st...
Microcontrollers :: 08 Jul 2008 14:50 :: ctownsend :: Replies: 4 :: Views: 378

at89s51 programming help

hi i would like to make own programmer for at89s51/52/53 and avr.in this serial programming(isp) mode i am not able read the memory,when i send read commands(as per document doc2487-command is 0x20,0x00,0x00--- 0th memory) after program enable(cmd is...
Microcontrollers :: 27 Oct 2007 7:36 :: vijayragavalu :: Replies: 11 :: Views: 2073

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avr jtag emulator?

hi all!anyone know anything about building your own jtag-emulator for avr?i found the schematics, but there should be some firmware involved as well...thanks/janne...
Microcontrollers :: 14 Feb 2007 21:12 :: dmrak :: Replies: 108 :: Views: 40634

avr problem

hi all, i;m new in avr. ive just built one add parallel port programmer to program avr, software is ispprog. (1)i connect the mosi, miso, sck, rst, gnd, vcc pin to atmega8535. i was able to program it.(2) i connect mosi, miso,sck,rst,gnd,vcc pin to a...
Microcontrollers :: 02 Feb 2007 9:09 :: cancel :: Replies: 9 :: Views: 2679

very accurate low resistance measurement problem

hi,i need to design a very accurate ohmeter for a copper wire tube. at present i put 0.5a through the wire (26.4-28.4 ohms). the voltage is then shifted down throrough a potential divider. the tester seems to drift with time. i am currently running s...
Analog Circuit Design :: 27 Oct 2006 11:16 :: nsakan :: Replies: 12 :: Views: 1266

very nice collection of circuits and datasheets

hi allthis is a very nice collection of tutorial circuits hope itll be helpful for all of ucheerscontenents7_2 volt nicad cycler555 timer go-no-go tester555 timer ic tester555 timer-oscillator tutorial741 op-amp tutoriala super-simple nicd-battery re...
Service Manuals, Requests, Repair Tips :: 17 Sep 2006 14:07 :: engkimoz :: Replies: 7 :: Views: 5595

problem on using avr fuse bits

hi all.i was working with bascom and its programmer.i change the fuse bits (internal rc to external oscilator) and program it, but afther thisi couldent program any more.it seems to be locked.but reset chip button dosent work.how can i solve this pro...
Microcontrollers :: 26 Aug 2006 4:20 :: arash_micro :: Replies: 8 :: Views: 303

unlock avr just to erase plz help.

hi to all, can anyone help plz.i buy some junk for spars, but some avr at89cxx,at902313 came lock, i dont care about the firmware just erase the avr for other use. its posible to do it. sorry my bad english.thanks....
Microcontrollers :: 13 Jun 2006 22:16 :: cesarman :: Replies: 5 :: Views: 456

reprogram avr

hi,i have bought a avr programmer and i had programmed atmega128 ai.i had programmed it . but now i am not able to reprogram it.does it means that i have accidently locked the mcu and i cant program it futher more ?if so,what i suppose to do ? use a ...
Microcontrollers :: 30 Mar 2005 7:03 :: Mazi3 :: Replies: 5 :: Views: 462

on-chip debugging for atmel atmega series

hi,the new atmega series is described with on-chip debugging.how can i make that work with mine (atmega32).thx in advance!...
Microcontrollers :: 03 Dec 2003 21:14 :: ME :: Replies: 3 :: Views: 769

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