Kleiner Bascom AVR Kurs -
Fusebits Standardeinstellungen

Hallo!

Es geht um die Frage, wie die Fusebits in den meisten Fällen eingestellt werden müssen.

Und hier ist sie, die Auflistung der meist eingesetzten Standardeinstellungen der Fusebits für den ATmega8.

mySmartUSB mit "myAVR Workpad Plus"

1 Mhz interner RC-Oscillator

Low Fuse

• 11100001
• Brown-out detection level at VCC=2.7 V; [BODLEVEL=1]
• Int. RC Osc. 1 MHz; Start-up time: 6 CK + 64 ms; [CHSEL=0001 SUT=10]; default value

High Fuse

• 11011001
• Serial program downloading (SPI) enabled; [SPIEN=0]
• Boot Flash section size=1024 words Boot start address=$0C00; [BOOTSZ=00]; default value

Lockbits

• 11111111
• Mode 1: No memory lock features enabled
• Application Protection Mode 1: No Lock on SPM and LPM in Application Section
• Boot Loader Protection Mode 1: No lock on SPM and LPM in Boot Loader Section

8 Mhz interner RC-Oscillator

Low Fuse

• 11100100
• Brown-out detection level at VCC=2.7 V; [BODLEVEL=1]
• Int. RC Osc. 8 MHz; Start-up time: 6 CK + 64 ms; [CKSEL=0100 SUT=10]

High Fuse

• 11011001
• Serial program downloading (SPI) enabled; [SPIEN=0]
• Boot Flash section size=1024 words Boot start address=$0C00; [BOOTSZ=00]; default value

Lockbits

• 11111111
• Mode 1: No memory lock features enabled
• Application Protection Mode 1: No Lock on SPM and LPM in Application Section
• Boot Loader Protection Mode 1: No lock on SPM and LPM in Boot Loader Section

3-8 Mhz externer Quarz

Low Fuse

• 11111111
• Brown-out detection level at VCC=2.7 V; [BODLEVEL=1]
• Ext. Crystal/Resonator High Freq.; Start-up time: 16K CK + 64 ms; [CKSEL=1111 SUT=11]

High Fuse

• 11011001
• Serial program downloading (SPI) enabled; [SPIEN=0]
• Boot Flash section size=1024 words Boot start address=$0C00; [BOOTSZ=00]; default value

Lockbits

• 11111111
• Mode 1: No memory lock features enabled
• Application Protection Mode 1: No Lock on SPM and LPM in Application Section
• Boot Loader Protection Mode 1: No lock on SPM and LPM in Boot Loader Section

8-16 Mhz externer Quarz

Low Fuse

• 11111111
• Brown-out detection level at VCC=2.7 V; [BODLEVEL=1]
• Ext. Crystal/Resonator High Freq.; Start-up time: 16K CK + 64 ms; [CKSEL=1111 SUT=11]

High Fuse

• 11001001
• Serial program downloading (SPI) enabled; [SPIEN=0]
• Boot Flash section size=1024 words Boot start address=$0C00; [BOOTSZ=00]; default value
• CKOPT fuse (operation dependent of CKSEL fuses); [CKOPT=0]

Lockbits

• 11111111
• Mode 1: No memory lock features enabled
• Application Protection Mode 1: No Lock on SPM and LPM in Application Section
• Boot Loader Protection Mode 1: No lock on SPM and LPM in Boot Loader Section

PonyProg

1 Mhz interner RC-Oscillator

Lockbits

• 11111111

High Fuse

• 11011001
• SPIEN
• BOOTSZ1
• BOOTSZ0

Low Fuse

• 11100001
• SUT0
• CKSEL3
• CKSEL2
• CHSEL1

8 Mhz interner RC-Oscillator

Lockbits

• 11111111

High Fuse

• 11011001
• SPIEN
• BOOTSZ1
• BOOTSZ0

Low Fuse

• 11100100
• SUT0
• CKSEL3
• CKSEL1
• CHSEL0

3-8 Mhz externer Quarz

Lockbits

• 11111111

High Fuse

• 11011001
• SPIEN
• BOOTSZ1
• BOOTSZ0

Low Fuse

• 11111111

8-16 Mhz externer Quarz

Lockbits

• 11111111

High Fuse

• 11001001
• SPIEN
• CKOPT
• BOOTSZ1
• BOOTSZ0

Low Fuse

• 11111111

mfg Gerold :-)

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