Hi Eric.
I've no direct contact with Atmel at this time. FYI I checked another
brand new ATMEGA1280 and it shows the same problem. Setting bit 3 to
zero fixes this issue as the new value is accepted by the target.
Regards,
Bernard
Eric Weddington wrote:
Hi Bernard,
Your best bet is to send this issue to avr AT atmel.com and see if they know
what's going on here.
Thanks,
Eric Weddington
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Bernard Fouché
Sent: Monday, August 20, 2007 5:47 AM
To: [email protected]
Subject: [avr-chat] Trouble with ATMEGA 1280 extended fuse byte
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
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