134 Threads found on edaboard.com: Fuse Bits
I first time try to work on AVRs(Atmega64).
When try to program it with Bascom11173 and STK200. It looks it work only first time, when I do some changes in fuse bits it then never again be connected/detected.
Now the device is no more detected by Bascom, also tried PonyProg2000 but could not succeeded.
My question is that is there any po
Microcontrollers :: 21.11.2003 16:40 :: sadat007 :: Replies: 9 :: Views: 3486
Your problem is that your chip is waiting for the external oscilator to start working :D it doesn't work anymore from the internal oscilator. You can attach a crystal to the chip and program the fuse bits to internal oscilator again, then you can remove the crystal again.
yes, your problem is external clock.
Microcontrollers :: 24.08.2006 03:03 :: hr_rezaee :: Replies: 8 :: Views: 1453
i am faced with this problem that after writing my code and after building the solution when i just move on to download it to my mcu through my setup of avrstudio4 with winavr as compiler and stk500 attached to comp via rs232 and to target via isp 6 pin cable ..... the interface do open for setting the various values like fuse
Microcontrollers :: 28.12.2006 19:51 :: ashish sharma :: Replies: 0 :: Views: 1081
actually i messed up with fuse bits of atmega 32l and now they are not giving me the way.....
how to erase and restore the mcu ..
simple chip erase using high voltage seriel programming also is not working
Microcontrollers :: 29.12.2006 10:51 :: ashish sharma :: Replies: 4 :: Views: 1091
well u can use BASCOM AVR to change the fuse bit so easy. try it
as i show in the picture u can change what u need .
Microcontrollers :: 29.02.2008 08:25 :: segmex :: Replies: 1 :: Views: 2740
Do you know how to change the fuse bits in running mode
I use IAR compiler.
Thanks in advance
Microcontrollers :: 07.09.2010 07:13 :: xxtigerxx :: Replies: 0 :: Views: 646
ATMega8 fuse Calculator
AVR fuse Calculator for ATmega8
here you are
Microcontrollers :: 19.09.2010 03:46 :: zoro1 :: Replies: 4 :: Views: 3277
Every one when new to AVR got into trouble with fuse bits.
You should be careful while setting fusebits. Double check before writing fusebits.
If you messed up with fusebits then the avr wont behave as it should and you need a high voltage parallel (...)
Microcontrollers :: 30.11.2010 12:22 :: nandhu015 :: Replies: 2 :: Views: 830
needless to say the program did not work
Your considerations are not plausible. In fact, by connecting an external clock source to XTAL1, you get the oportunity to access an ATmega indpendent of the presently set oscillator fuses. See datasheet, "Serial Downloading", Figure 112.
The factory fuse configuration sets internal RC osc
Microcontrollers :: 21.06.2011 16:45 :: FvM :: Replies: 4 :: Views: 670
Yes it is a nice front end to avrdude, I find it very convenient.
It just doesn't have security fuses so if want to change them you have to use a different way like command line of avrdude or a different program like ponyprog or even AVR studio (ISP or JTAG) if your programmer is supported.
Microcontrollers :: 04.11.2011 05:17 :: alexan_e :: Replies: 6 :: Views: 3122
I don't have any experience with this but you can check avr-libc: fuse.h>: fuse Support
Microcontrollers :: 19.12.2011 16:46 :: alexan_e :: Replies: 1 :: Views: 881
From the other thread, I've read that you used the 16F877A. Maybe you're referring to the configuration bits of the PIC.
Here you can read about the fuse bits of the AVR microcontroller:
Microcontrollers :: 21.03.2012 10:49 :: Tahmid :: Replies: 1 :: Views: 702
The fuse bits available in each mcu model are described in the datasheet in the memory programming section.
The main fuses you need to set are usually the ones related to the clock source selection.
If you want to use the jtag pins as I/O then you need to disable JTAGEN.
Don't change SPIEN because it can disable the serial programming. (...)
Microcontrollers :: 28.09.2012 02:57 :: alexan_e :: Replies: 1 :: Views: 637
This was my only problem which I am always facing after moving from pic to avr. I am using usbasp programmer. Lot of avr chips are screwed due to fusebit problem. But the interesting thing is, it is getting screwed some time even if we are not doing any thing on the fuse. Just burning flash also makes the fuse bits (...)
Microcontrollers :: 15.11.2012 07:03 :: vinodstanur :: Replies: 16 :: Views: 1000
I have an ATMEGA8L that its RSTDISBL fuse bit is cleared and now its
RESET pin is configured as an IO pin, I want to reprogram this device
with an ISP programmer, is it possible? If yes HOW?
Microcontrollers :: 17.09.2004 06:59 :: madjid :: Replies: 3 :: Views: 2483
do you have a schematic or know link of a project wich can be used for unprogramming rstdisbl and spien fuse bits ?
cause they can be programmed by ISP prorgrammer but can't be unprogrammed by ISP any more so a high voltage programmer should be used ...
i found a project for high voltage programmer, but if there is a circuit wich onl
Microcontrollers :: 09.10.2008 13:48 :: hm_fa_da :: Replies: 6 :: Views: 3616
SinaProg - AVRProg GUI for AVRDUDE 5.6 with AVR fuse
Software Links :: 05.05.2009 03:08 :: tizchangal :: Replies: 3 :: Views: 8139
SinaProg 22.214.171.124 - AVRDUDE-GUI with AVR fuse
Software Links :: 01.01.2010 10:39 :: tizchangal :: Replies: 0 :: Views: 858
i need to restore a protected PIC to reprogramm only the fuses.
Is it possible?
Microcontrollers :: 06.01.2010 13:45 :: Gigillo74 :: Replies: 4 :: Views: 1267
SinaProg 126.96.36.199 - AVRProg GUI for AVRDUDE 5.10 with AVR fuse
Software Links :: 01.02.2010 01:09 :: tizchangal :: Replies: 0 :: Views: 924
Hi everybody, how’s going. This one of my firsts posts. I’ve been working in a project and one of the problems or something a little bit difficult to understand (if like me it’s the first time using AVR’s ) had been the fuse configuration. Here i left some interesting and useful links.
Microcontrollers :: 28.04.2010 22:57 :: cerberolooch :: Replies: 0 :: Views: 715
SinaProg 188.8.131.52 - AVRDUDE-GUI with AVR fuse Calculator
__________* You can edit the file "fuses.txt", to add your comments for
Software Links :: 10.08.2010 10:24 :: tizchangal :: Replies: 0 :: Views: 296
I change the fuse settings manually to 99 E1, which is the factory default (atmega16 datasheet), as the programmer software does not have any reset to default option.
You're correct that is the default setting for an ATMEGA32. Obviously, these correct fuse settings are not actually being programmed into the device.
Microcontrollers :: 16.08.2011 15:40 :: bigdogguru :: Replies: 9 :: Views: 592
The project can be found Atmega HVPP fusebit doctor – napraw fusebity, fix fusebits >> Manekinen DIY
It is also uploaded in a thread related to locked AVRs
---------- Post added at 19:10 --
Microcontrollers :: 24.10.2011 12:10 :: alexan_e :: Replies: 2 :: Views: 2193
Page 25/26 of the datasheet
The CKOPT fuse selects between two different Oscillator
amplifier modes. When CKOPT is programmed, the Oscillator output will oscillate will a full rail-
to-rail swing on the output. This mode is suitable when operating in a very noisy environment or
when the outpu
Electronic Elementary Questions :: 28.11.2011 03:02 :: alexan_e :: Replies: 3 :: Views: 1897
If I just make the lock bits to lock the code can anyone else change the lock bits back to 3f and read the code ? This is reason I was disabling the serial programming..
I am confused here, I think I have accidentally wasted my chip, Now is it possible to completely lock the chip by just using lock bits , means no one can r
Microcontrollers :: 03.02.2012 23:43 :: nandhu015 :: Replies: 26 :: Views: 2869
You can program the fuse bits using usbasp.
If by any mistake you programmed wrong fuse bits, there is a chance that you have selected external clock instead of crystal oscillator and internal oscillator. I have faced a similar problem while programming an avr. In such case, you need to provide an external clock (around (...)
Microcontrollers :: 21.06.2012 15:25 :: vinodstanur :: Replies: 2 :: Views: 527
You can use this calculator
You have currently set your mcu to external clock so you need to connect an external clock source in the XTAL1 pin to reprogram it.
You can use another avr set to toggle a pin on/off as a clock or a crystal oscillator or even a 555 should do.
- - - Updated - - -[/C
Microcontrollers :: 25.07.2012 06:24 :: alexan_e :: Replies: 16 :: Views: 4018
I don't see anything wrong with your fuse settings, they are set to internal RC 4MHz.
Try to use which is a front end for avrdude.
Use the settings to set the programmer to usbtiny and try to read the fuse to see if you have connection.
If you can connect program the chip w
Microcontrollers :: 12.08.2012 07:16 :: alexan_e :: Replies: 7 :: Views: 529
Jtag enabled etc
There is no JTAG in ATMEGA8.
Looking at the attachment fuse for internal 8MHz is correct.
Do you need bootloader which is selected for 1024 bytes in your attachment.
Microcontrollers :: 24.09.2012 02:14 :: nandhu015 :: Replies: 10 :: Views: 928
hey guys im using atmega 168A -pu im beginner with avr i have some basic doubts as to can i use 20mhz crystal and if so ive done the fuse settings can you please tell me if its right spien-programmed(logic 0) brownout programmed to 4.3V BODLEVEL1=programmed(logic 0) BODLEVEL0=programmed(logic 0) BOOTSZ1=programmed(logic 0) BOOTSZ0=
Microcontrollers :: 30.09.2012 02:46 :: Elimathew :: Replies: 6 :: Views: 373
When you start the programmer, there are three tabs, use the third tab for fuse bit settings.
If you wish to write those bits, use the check box and then write it. see the attached image.
the value of fuse bits and lock bits can be calculated using the
Microcontrollers :: 12.04.2013 19:18 :: ark5230 :: Replies: 1 :: Views: 267
Yes, your setting is fine, you can check using
Note that for crystals >8MHz you should program the CKOPT fuse but for 8MHZ both modes will work
Microcontrollers :: 28.07.2013 08:55 :: alexan_e :: Replies: 1 :: Views: 100
Setting the ISP fuse on an AVR can only be done via "High Voltage Parallel Mode".
Search on the net for STK-500 or AVRISP schematics.
Or maybe the words "AVR High Voltage Parallel Mode"
Remember if you FSCK'ed up your internal oscilator settings you have to apply external clock to the AVR.
Microcontrollers :: 27.08.2005 07:15 :: Bingo600 :: Replies: 2 :: Views: 1144
u see fuse bits for it is some information about fuse bits !!!
Microcontrollers :: 30.07.2006 01:42 :: hr_rezaee :: Replies: 8 :: Views: 1947
I have a problem with programming Tiny13.
When I disable reset pin (fuse RSTDISBL=0), further programming is not possible. The programmer doesn't detect the device. I use this - high voltage serial programmer.
There is a errata in the datasheet about combinations of fuse bits that may lock
Microcontrollers :: 23.01.2006 13:46 :: luckym :: Replies: 0 :: Views: 2353
Ponyprog will work immediately with any fresh AVR without setting any fuse bits.
DON'T play aroud with the fuse bits unless you know what you're doing, otherwise you will never be able again to flash your AVR
You don't need to enable/disable any internal clocks because all AVR's are con
Microcontrollers :: 05.02.2006 03:59 :: silvio :: Replies: 4 :: Views: 702
What about watchdog it enabled by default.Or disabled.Or is there any configuration bits like PIC
The WDT Initial state of AT90S4414/8515 is disabled at power-up and similar with Safety level 0 of ATMega8515 (fuse bit S8515C programmed "0" and WDTON unprogrammed "1").
If you're using PonyProg typing CTR
Microcontrollers :: 09.03.2006 08:31 :: silvio :: Replies: 4 :: Views: 960
try to use ponyprog on it's a popular software. almost new avr device will use internal rc . if you want to use external crystal you must set fuse bit
Microcontrollers :: 17.03.2006 07:32 :: necromancer :: Replies: 3 :: Views: 1267
the problem is tht ur jtage is enabled. You have to do fuse bits to disable it. Some examples of doing fuse bits are available on the book
MY EXPERIENCE IN PROGRAMMING AVR MICROCONTROLLERS IN C USING WINAVR
You can get the book from
Microcontrollers :: 07.05.2006 11:53 :: yogi :: Replies: 2 :: Views: 610
I think it's better to use PonyProg instead of AT-PROG, because AT-PROG is a bit outdated now, and the free version is limited to 1k of program memory.
I think I have AT-PROG and programmer schematic on an old CD, so I can post them if I will find them. AT-PROG was my first AVR programmer, but I don't use it anymore, because is size limited (free
Microcontrollers :: 27.04.2006 16:36 :: Eugen_E :: Replies: 2 :: Views: 1512
AVRs have ISP capability, which means they can be programmed by an easier interface called ISP. But there are Some fuse bits that if you program them then the chip would not be programmed by an ISP programmer any longe such as Reset Pin/Oscillator/Etc.
in these situations you will need a parallel programmer to erase the chip back to the defualt fa
Microcontrollers :: 13.06.2006 00:10 :: farshidjh :: Replies: 5 :: Views: 1882
I'm using ICC-AVR and i can't set fuses.How to set them?
(I want to use crystal but the micro uses the internal 1M OSC)
Microcontrollers :: 02.07.2006 04:31 :: arash_micro :: Replies: 4 :: Views: 504
Yes,with JTAG you can do software debugging and programming of micro in both JTAG and in ISP mode.
In JTAG mode you can program FLASH and EEPROM and fuse bits ,you can do this also in ISP mode of JTAG ICE.
Microcontrollers :: 20.12.2006 13:04 :: 7rots51 :: Replies: 9 :: Views: 1322
Actually my problem is concerned with programming atmega32l (not atmega32) on stk500 .
the tools i am using are: winavr with avrstudio4 (ide) version 1.3 build 460
I would like to state the problem in detail relying on the fact that atmega32l is supported on stk500.
The bug is that when i try to change th
Microcontrollers :: 29.12.2006 23:28 :: ashish sharma :: Replies: 8 :: Views: 1443
there's something called lock bits sometime called fuse bits i think that are used to lock the code..
give some details of your project and definitely someone can tell you exactly how to do it..
interestingly, on a sidenote, a hell lot of work is going into how to recover programs that have been protected this way, and people have (...)
Microcontrollers :: 20.02.2007 05:58 :: wiztronix :: Replies: 7 :: Views: 651
What is your code ? Where is you code ?
Have you set the fuse bits correctly ?
Microcontrollers :: 04.04.2007 14:48 :: vsmGuy :: Replies: 6 :: Views: 3176
JTAG is a digital level interface only. There are no analog or intermediate level signalling. The typical non-isolated JTAG interface has pull-up resistors on most of the lines. If the PC side is driving the outputs as open collector, then you need to add pullup resistors to the PC side of TCK, TDI, and TMS.
The output signal from the microco
Microcontrollers :: 18.04.2007 13:45 :: banjo :: Replies: 1 :: Views: 744
Selecting External clock should be done with programmer
if you tell me what programmer are you using, then i can help you
It is done by setting clksel bits in fuse bits
Microcontrollers :: 05.06.2007 10:11 :: nandhu015 :: Replies: 5 :: Views: 3462
i have made an avr jtagice clone from this site
i try jtagice with atmega128.
avrstudio is find the jtagice clone and connect it. i can erase atmega128 and read fuse bits. but i can't program a hex file or read chip. avrstudio is giving error message like this,
Microcontrollers :: 20.06.2007 03:20 :: controller :: Replies: 1 :: Views: 772