Device selection

Select the AVR device type you want to configure. When changing this setting, default fuse settings will automatically be applied. Presets (hexadecimal representation of the fuse settings) can be reviewed and even be set in the last form at the bottom of this page.

AVR part name: (141 parts currently listed)

Feature configuration

This allows easy configuration of your AVR device. All changes will be applied instantly.

Features

Brown-out detection enabled; [BODEN=0]

Boot Reset vector Enabled (default address=$0000); [BOOTRST=0]

Preserve EEPROM memory through the Chip Erase cycle; [EESAVE=0]

CKOPT fuse (operation dependent of CKSEL fuses); [CKOPT=0]

Serial program downloading (SPI) enabled; [SPIEN=0]

Watch-dog Timer always on; [WDTON=0]

Reset Disabled (Enable PC6 as i/o pin); [RSTDISBL=0]

Manual fuse bits configuration

This table allows reviewing and direct editing of the AVR fuse bits. All changes will be applied instantly.
Note: means unprogrammed (1); means programmed (0).

Current settings

These fields show the actual hexadecimal representation of the fuse settings from above. These are the values you have to program into your AVR device. Optionally, you may fill in the numerical values yourself to preset the configuration to these values. Changes in the value fields are applied instantly (taking away the focus)!

Low

High

Action

AVRDUDE arguments

Apply manual changes to the values on the left side, or load factory default values for the selected device.

-U lfuse:w:0xe1:m -U hfuse:w:0xd9:m

Select (try triple-click) and copy-and-paste this option string into your avrdude command line. You may specify multiple -U arguments within one call of avrdude.

References

All information based on database ATmega8.xml build 186.
Applied patches: SUT and WDTON default values (Mark Haemmerling)

No responsibility is taken for the correctness of the presented information.
Copyright © 2006-2021 Mark Hämmerling. This is a free service of Engbedded. Use at your own risk.
User interface version: 0.9.3.

If you find bugs in the user interface or the database backend(s), please report them.

Bit	Low	High
7	BODLEVEL Brown out detector trigger level	RSTDISBL Disable reset
6	BODEN Brown out detector enable	WTDON Enable watchdog
5	SUT1 Select start-up time	SPIEN Enable Serial programming and Data Downloading
4	SUT0 Select start-up time	CKOPT Oscillator Options
3	CKSEL3 Select Clock Source	EESAVE EEPROM memory is preserved through chip erase
2	CKSEL2 Select Clock Source	BOOTSZ1 Select Boot Size
1	CKSEL1 Select Clock Source	BOOTSZ0 Select Boot Size
0	CKSEL0 Select Clock Source	BOOTRST Select Reset Vector