[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[avr-chat] Trouble with ATMEGA 1280 extended fuse byte
From: |
Bernard Fouché |
Subject: |
[avr-chat] Trouble with ATMEGA 1280 extended fuse byte |
Date: |
Mon, 20 Aug 2007 13:47:25 +0200 |
User-agent: |
Thunderbird 2.0.0.6 (Windows/20070728) |
Hi List.
I have the following problem:
- I use an "ATMEGA1280 V 8AU 0622".
- ATMEGA1280 data sheet (2549K-AVR-10/07) says (table 151, page 343)
that only the lower 3 bits of the extended fuse byte can be programmed
and all other bits should be '1'. IMHO it means that acceptable values
are from 0xF8 to 0xFF.
- When I try to set my fuses to 0xFD (to have Brown-Out Detection (BOD)
at 2.7volts, see table 27 page 60), avrude complains that while it wrote
0xFD, it reads 0xF5.
- When using AVRSTUDIO4, I also read 0xF5 for this fuse byte.
- 0xF5 is 11110101 -> bit 3 is zero, not one.
Did I miss something obvious or is the datasheet wrong? If so, what bit
3 means ?
Thanks!
Bernard
- [avr-chat] Trouble with ATMEGA 1280 extended fuse byte,
Bernard Fouché <=