If one wishes to do "accurate" timing I wouldn't recommend
using non-xtal oscillators. The MeasureClock thing sounds
promising however...I didn't know we could kick up the clock
rate a bit with the config. thanks...
What I meant about about reading the fuses seems to have been borne
out in fact. Getting all 0xff (or 0x00's) just "feels" like there
is something that is not actually being read correctly.
MS
Giri Baleri wrote:
A more comprehensive description of various fuse bytes is available in
Appendix B of the XMesh manual below.
http://www.xbow.com/Support/Support_pdf_files/XMesh_Users_Manual.pdf
A low fuse byte value of 0xc4 would set it to internal oscillator. I
think the ATmega128's internal RC oscillator can provide a fixed 1.0,
2.0, 4.0, or 8.0 MHz clock.
Giri
-----Original Message-----
From: Michael Schippling [mailto:[EMAIL PROTECTED]
Sent: Tuesday, July 17, 2007 10:17 PM
To: Giri Baleri
Cc: roberto pagliari; [email protected]
Subject: Re: [Tinyos-help] atmega128 clock frequency
whew...now I don't have to go look up the config bytes...
Is there an internal osc that will run faster than the xtal?
And are we certain that the config is really all 0xff?
That sounds too conveniently like a read error...
MS
Giri Baleri wrote:
The low byte value of 0xff indicates that the ATmega128 is configured
to use external oscillator. The frequency of the external oscillator
is normally 7.3728 MHz.
Giri
----------------------------------------------------------------------
--
*From:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] *On Behalf Of
*roberto pagliari
*Sent:* Tuesday, July 17, 2007 3:27 PM
*To:* [EMAIL PROTECTED]
*Cc:* [email protected]
*Subject:* Re: [Tinyos-help] atmega128 clock frequency
my actual configuration, running
uisp -dprog=data -dpart=ATmega128 --rd_fuses
gives me the following
fuse low byte 0xff
fuse high byte 0xff
fuse extended byte 0xff
calibration byte 0xff - read only
lock bits 0xff
BLB12 -> 1
BLB11 -> 1
BLB02 -> 1
BLB01 -> 1
LB2 -> 1
LB1 -> 1
so, is it 7.3Mhz?
On 7/17/07, *roberto pagliari* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
my fuse low byte is set to 0xff. this means the clock frequency is
7.3Mhz (not 8Mhz) right?
thank you in advance
On 7/17/07, *Michael Schippling* < [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
I think "change the crystal" is the only answer for the
ATMEGA.
It's sounds like the MSP can be overclocked in software
though.
MS
roberto pagliari wrote:
> how can I set the clock frequency of motes microcontroller?
> I'm using micaz mote right now
>
>
>
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