search

CyberCircuits / optiboot

Automatically exported from code.google.com/p/optiboot
0 stars 0 forks source link

Oscillator fuse value: low power vs full swing #76

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Most optiboot ISP targets are setting the fuse values to enable the "low power 
oscillator" option, even though 16MHz is the max recommended speed for this 
configuration.  The "Full swing" oscillator might be more appropriate.
This has been implicated in 1284 upload problems where uart rx and clock pins 
are next to each other, and hard data transmission to the AVR apparently causes 
clock failures.  Using the full-swing setting is said to reduce the likelyhood 
of this problem.

Original issue reported on code.google.com by wes...@gmail.com on 6 Feb 2013 at 12:54

GoogleCodeExporter commented 9 years ago 
Atmel notes that the "full swing" mode is preferred for "noisy environments".  
That mode does, however, cause greater power consumption than the low power 
modes.  I would suggest that the full swing mode is probably a better choice 
for general purpose use as it will be reliable over a larger range of 
application environments.

Don Kinzer

Original comment by dkin...@gmail.com on 9 Feb 2013 at 3:50

GoogleCodeExporter commented 9 years ago 
Committed via 
http://code.google.com/p/optiboot/source/detail?r=5137423bfb2ed606ccb57da0fe4ab9
963a5bc045

Original comment by wes...@gmail.com on 7 Mar 2013 at 6:33