Thank you for moving this, I guess it deserved its own thread.
This question concerns the Atmel programmer's fuse options and the fuse choices as listed on the fuse calculator at
http://www.engbedded.com/fusecalc/One thing I have never understood well is the clock choices. I always use a 16mhz crystal with 2 22pf caps and select the last on the list and it works. What do the clock selections mean?
Ext. Clock; - true square wave signal? Applied to which pin?
Int. RC Osc. 8 MHz - OK, I know what this means.
Ext. Low-Freq. Crystal - no idea how this varies from the bottom one.
Ext. Full-swing Crystal - no idea how this varies from the bottom one.
Ext. Crystal Osc. - OK, I get this, but have never seen anyone suggest one other than the 16 mhz crystals. Some of the chips are rated for 20mhz, do you just use a 20mhz crystal to achieve that?
What do the other values mean, e.g. "Start-up time PWRDWN/RESET: 16K CK/14 CK + 65 ms;" Total confusion there.
Would love a quick schooling on these matters if anyone wants to chime in.
Ext. Clock; Start-up time PWRDWN/RESET: 6 CK/14 CK + 0 ms;
Ext. Clock; Start-up time PWRDWN/RESET: 6 CK/14 CK + 4.1 ms;
Ext. Clock; Start-up time PWRDWN/RESET: 6 CK/14 CK + 65 ms;
Int. RC Osc. 8 MHz; Start-up time PWRDWN/RESET: 6 CK/14 CK + 0 ms;
Int. RC Osc. 8 MHz; Start-up time PWRDWN/RESET: 6 CK/14 CK + 4.1 ms;
Int. RC Osc. 8 MHz; Start-up time PWRDWN/RESET: 6 CK/14 CK + 65 ms;
Int. RC Osc. 128kHz; Start-up time PWRDWN/RESET: 6 CK/14 CK + 0 ms;
Int. RC Osc. 128kHz; Start-up time PWRDWN/RESET: 6 CK/14 CK + 4.1 ms;
Int. RC Osc. 128kHz; Start-up time PWRDWN/RESET: 6 CK/14 CK + 65 ms;
Ext. Low-Freq. Crystal; Start-up time PWRDWN/RESET: 1K CK/14 CK + 0 ms;
Ext. Low-Freq. Crystal; Start-up time PWRDWN/RESET: 1K CK/14 CK + 4.1 ms;
Ext. Low-Freq. Crystal; Start-up time PWRDWN/RESET: 1K CK/14 CK + 65 ms;
Ext. Low-Freq. Crystal; Start-up time PWRDWN/RESET: 32K CK/14 CK + 0 ms;
Ext. Low-Freq. Crystal; Start-up time PWRDWN/RESET: 32K CK/14 CK + 4.1 ms;
Ext. Low-Freq. Crystal; Start-up time PWRDWN/RESET: 32K CK/14 CK + 65 ms;
Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 258 CK/14 CK + 4.1 ms;
Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 258 CK/14 CK + 65 ms;
Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 1K CK /14 CK + 0 ms;
Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 1K CK /14 CK + 4.1 ms;
Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 1K CK /14 CK + 65 ms;
Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 16K CK/14 CK + 0 ms;
Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 16K CK/14 CK + 4.1 ms;
Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 16K CK/14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 0.4-0.9 MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 0.4-0.9 MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 0.4-0.9 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 0 ms;
Ext. Crystal Osc.; Frequency 0.4-0.9 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 0.4-0.9 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 0.4-0.9 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 0 ms;
Ext. Crystal Osc.; Frequency 0.4-0.9 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 0.4-0.9 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 0.9-3.0 MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 0.9-3.0 MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 0.9-3.0 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 0 ms;
Ext. Crystal Osc.; Frequency 0.9-3.0 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 0.9-3.0 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 0.9-3.0 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 0 ms;
Ext. Crystal Osc.; Frequency 0.9-3.0 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 0.9-3.0 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 0 ms;
Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 0 ms;
Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 0 ms;
Ext. Crystal Osc.; Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 1K CK /14 CK + 65 ms;
Ext. Crystal Osc.; Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 0 ms;
Ext. Crystal Osc.; Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 4.1 ms;
Ext. Crystal Osc.; Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 65 ms;