Objective Development Forums

Attiny461

2009-01-14T19:02:47+02:00

First I tried the 12.8MHz mode.
It didn't work .

I finally got my 12MHz crystal and tried it.
It didn't work .

Then I noticed that the resistor for D- was on D+.
Fixed it and It works .

Thanks for the help!

Statistics: Posted by IDK — Wed Jan 14, 2009 7:02 pm

Attiny461

2008-12-22T11:36:33+02:00

I was under the same impression (that the V types use the same silicon but are selected by parameters), but users reported that the same circuit works with a non-V type while it fails with a V type. This was at 16 MHz, as far as I remember.

Statistics: Posted by christian — Mon Dec 22, 2008 11:36 am

Attiny461

2008-12-21T19:22:07+02:00

"V" Devices use the same silicon as the non "V" versions.

With higher supply they behave linke the non V's.

Regards,

D.

Statistics: Posted by Guest — Sun Dec 21, 2008 7:22 pm

Attiny461

2008-12-21T12:38:11+02:00

Thanks for the clarification.

16MHz may be too much of an overclock for the V version. I know of one user who sucessfully used a 12MHz crystal w/ the 461V tho.

Statistics: Posted by Grendel — Sun Dec 21, 2008 12:38 pm

Attiny461

2008-12-20T21:40:22+02:00

I didn't get it to work with the zenerdiodes, and I do got the V version... (the one's I bought it from didn't list it as a V version... hmm)

I bought a 16 MHz oscillator and I'm going to try to get that one to work.

Statistics: Posted by IDK — Sat Dec 20, 2008 9:40 pm

Attiny461

2008-12-19T23:27:53+02:00

The 12 MHz module needs the precision of a crystal, the 12.8 MHz module does not. The additional 0.8 MHz are spent for a software PLL.

Regarding the conflict between table 7-6 and figure 24-35: The table documents guaranteed values, the diagram real, measured values. The diagram reflects reality very closely.

Statistics: Posted by christian — Fri Dec 19, 2008 11:27 pm

Attiny461

2008-12-19T22:48:02+02:00

Oh, true. It does go up to 14MHz (somehow I thought it's only +/- 1MHz or so). Edit: ah, table 7-6 says 7.3-8.1MHz. Clashes w/ figure 24-35.

Quick question for Christian -- why 12.8MHz ? According to the 461 data sheet the oscillator could be calibrated to 12MHz as well.

Statistics: Posted by Grendel — Fri Dec 19, 2008 10:48 pm

Attiny461

2008-12-19T12:24:19+02:00

You can still try to get it running with the 12.8 MHz module. This should work on devices rated at 10 MHz.

Statistics: Posted by christian — Fri Dec 19, 2008 12:24 pm

Attiny461

2008-12-17T00:46:28+02:00

Good catch, I did not pay attention to the "V". Not sure the PLL is absent in the V version but the 10MHz speed grading alone makes this idea useless

Statistics: Posted by Grendel — Wed Dec 17, 2008 12:46 am

Re: Attiny461

2008-12-16T23:41:29+02:00

IDK wrote:I'm using an attiny461V with...
And does the internal PPL oscillator of the 461 work with easylogger?

Now, someone please correct me if I'm wrong (because I'd like this to work), but I think the PLL is not available in the V versions of the ATTiny{2,4,8}61 chips. (I'm not sure if you're using the V version or not...)

To quote Page 25 of the Datasheet:

The internal PLL in ATtiny261/461/861 generates a clock frequency that is 8x or 4x multiplied from a source input depending on the Low Speed Mode (LSM) bit.

And on page 1 it says:

–ATtiny261V/461V/861V: 0 - 4 MHz @ 1.8 - 5.5V, 0 - 10 MHz @ 2.7 - 5.5V
–ATtiny261/461/861: 0 - 10 MHz @ 2.7 - 5.5V, 0 - 20 MHz @ 4.5 - 5.5V

Unless I'm wrong (and I'd love to be) that means the V versions can't go over 10MHz, and don't have a PLL.

-Rob

Statistics: Posted by giseburt — Tue Dec 16, 2008 11:41 pm