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2006-04-04 by David VanHorn
Do you have the 20 MHz version of the part, and is your VCC within tolerance? It's possible that the chip has the serial programming disabled, did you try another chip? Beware, a virgin chip will be running on internal 1 MHz RC oscillator until you tell it otherwise, so setting y
2006-04-04 by John Samperi
At 02:34 PM 4/04/2006, you wrote: >You are looking at worst case, typical case is that it will work well. ...at room temperature of about 25 deg. :-) I would not use that method for, say, automotive application like Peter would use it for and definitely would not use it if someon
2006-04-04 by Russell Shaw
Peter Gargano wrote: > I have the reverse concern - Driving AVRs from parts designed to be > used with TTL. Most AVRs (eg Mega-168) have a 0.6VCC spec. on VIHmin > meaning 3.0 Volts when run at 5.0 Volts (well, actually worse case is > 0.6 x VCCmax which may give VIHmin of 3.15 V
2006-04-04 by John Samperi
At 02:13 PM 4/04/2006, you wrote: >My crystal clock frequency is 20Mhz .. but the maximum attainable >ISP frequency is 1.845 Mhz. Sorry I see the xtal frequency now... :-) That's ok because the ISP frequency is only for programming. REMEMBER however that new chips come with the 1
2006-04-04 by Kathy Quinlan
Peter Gargano wrote: > I have the reverse concern - Driving AVRs from parts designed to be > used with TTL. Most AVRs (eg Mega-168) have a 0.6VCC spec. on VIHmin > meaning 3.0 Volts when run at 5.0 Volts (well, actually worse case is > 0.6 x VCCmax which may give VIHmin of 3.15 V
2006-04-04 by Kishore Diggavi
Hi all, First of all , Thanks John for ur timely response. My crystal clock frequency is 20Mhz .. i wanted to run my controller at full speed i.e., 20Mhz .. in order to achieve that i've NOT selected the fuse "Divide clock by 8 internally". Its a known fact tat the ISP frequency
2006-04-04 by Peter Gargano
I have the reverse concern - Driving AVRs from parts designed to be used with TTL. Most AVRs (eg Mega-168) have a 0.6VCC spec. on VIHmin meaning 3.0 Volts when run at 5.0 Volts (well, actually worse case is 0.6 x VCCmax which may give VIHmin of 3.15 Volts). Many parts you may wan
2006-04-04 by David VanHorn
Very strange seeing that the typical HC chip has an input load of several MEGA Ohms (ie no current used) the LS has an input load of several Kilo Ohms (input current source up to 20ma!! A stupid question I know but are you sure ALL your ground pins on the chip are going to 0V? Ha
2006-04-04 by John Samperi
At 06:41 AM 4/04/2006, you wrote: >* I definately had the pins on the AVRs configured as outputs. I can't remember your original post...so you are saying that the Data Direction Register (DDRx) is set at 0xff (all 1) >* The same fault occured with both 74HC and 74LS chips, but on
2006-04-04 by David VanHorn
* The same fault occured with both 74HC and 74LS chips, but only on my newer batches of Mega16s and Tiny26s. This sets my alarm off.. The input threshold in HC is 1/2 VCC, and the gates neither source or sink any appreciable current. So, something's fishy. Common ground between t
2006-04-04 by kernels_nz
hi Jim, Yeah, ive almost given up, sounds a bit like a beginner mistake, but ive been working with AVRs on at least a weekly basis for about 4 years now, so it's nothing new. The DDR was set such that the 4 pins connecting to the inputs of the logic chip (74ls138 and 74hc138) wer
2006-04-04 by James Hatley
Hello Hein, Yes, sorry... we drifted away from your problem but it was an interesting discussion between Jose and I. Delighted that you were able to find and fix the problem but it is mysterious just why. I drive 74HC chips in several production environments without problem using
2006-04-03 by Henry Carl Ott
At 02:57 PM 4/3/2006, you wrote: >You are right, PINA is a read-only register. > Just a quick note, On some of the newer megas, PIN(x) registers are not just read only. It you write to the PIN bit it will toggle the PORT bit. Quite handy actually. -carl
2006-04-03 by John Samperi
At 11:25 PM 3/04/2006, you wrote: >(i've mentioned all my settings below) I could not see you crystal's clock frequency (maybe I missed that) whatever your clock frequency is, make sure that the STK500 is set at a max 1/4 of that. I usually have my clock for the programmer at abo
2006-04-03 by James Hatley
Yes, Jose, good point on pull ups. I forgot about them as I never use them here. I disable them globally. Old habits from using Motorola processors and if pull ups are needed I put the specific one required external to the processor. Good luck with your project. Jim ----- Origina
2006-04-03 by Jose Fuentes
--- James Hatley escribió: > Jose, > > All Atmel processors (as far as I know anyway) have > three registers for a > port, one is for setting the output bits that you > have declared output > (PORTA), one is for reading the input bits you > declared input (PINA) and of > course,
2006-04-03 by kernels_nz
Hmmhm, discussion seems to have strayed a bit, but just in case anyone ever runs across the same problem: * I definately had the pins on the AVRs configured as outputs. * The same fault occured with both 74HC and 74LS chips, but only on my newer batches of Mega16s and Tiny26s. *
2006-04-03 by James Hatley
Jose, All Atmel processors (as far as I know anyway) have three registers for a port, one is for setting the output bits that you have declared output (PORTA), one is for reading the input bits you declared input (PINA) and of course, the DDRA register for setting which bits are
2006-04-03 by Kishore Diggavi
Hi all, I'm working as firmware engineer @ India. I'm new to AVR controllers .. earlier i used to work on hitachi's H8 series .. I'm able to write the code in C & its working properly when i simulate the same .. the problem is dumping the code .. when i'm trying to dump the code
2006-04-03 by Jose Fuentes
I have a board with an AVR driving a LS chip directly, and it works fine. But I had problems with source code like this: PORTA = PINA | 0x01; It seems that under certain conditions PORTA is not equal to PINA. I modified the code like this: PORTA = PORTA | 0x01; and it solved the
2006-04-03 by dlc
The LS might require too much drive for a CMOS output, but the AVR's can drive LED's directly so they have lots of drive current. The HC part is a CMOS part and should pose no problems to the AVR. Many parts have weak pull up or pull downs on them. Is is possible to program those
2006-04-03 by Rick Hughes
We can all rest easy again; AVRFreaks appears to be back up now. -Rick
2006-04-03 by David VanHorn
Also, you should be able to reduce your power consumption a bit by changing CKOPT=1; read the description in the datasheet (you may not want to if you're in a noisy environment). I'm gonna do my best here to not go off on a rant. CKOPT should NEVER be left at 1 unless you're usin
2006-04-02 by Ned Konz
On Mar 31, 2006, at 4:56 AM, Massimo Banzi wrote: > > I'm having some weird issues with an Atmega8 based board where the > processor won't start the program unless the > avrisp dongle is connected. > > > You can see the circuit here http://www.potemkin.org/uploads/Pid/ > arduino_
2006-04-02 by Don Ingram
Thomas Keller wrote: > Kathy Quinlan wrote: >> AT76C712 is a cut down AVR 2 8 bit ports, a few 3 bit ports and a USB >> node :) >> >> BUT HEY 48Mhz this could be the answer to some projects :) >> http://www.atmel.com/dyn/products/product_card.asp?family_id=655&family_name=USB+Con
2006-04-02 by Leon Heller
----- Original Message ----- From: "Jesper Hansen" To: Sent: Sunday, April 02, 2006 10:37 PM Subject: Re: [AVR-Chat] Re: AVRFreaks.net down ? > AHA ! So it's YOUR fault ! > > fnatmed wrote: >> Dang. I was probably the last one there. I had *just* posted a msg >> which it took fin
2006-04-02 by Jesper Hansen
AHA ! So it's YOUR fault ! fnatmed wrote: > Dang. I was probably the last one there. I had *just* posted a msg > which it took fine, then I clicked to return to the forum : POOF - got > that error msg. > > Dean.
2006-04-02 by Ned Konz
On Mar 31, 2006, at 4:56 AM, Massimo Banzi wrote: > > I'm having some weird issues with an Atmega8 based board where the > processor won't start the program unless the > avrisp dongle is connected. > > > You can see the circuit here http://www.potemkin.org/uploads/Pid/ > arduino_
2006-04-02 by kernels_nz
Hi Guys, Ive had two different boards lately give a lot of trouble, both had OUTPUTS on AVR chips connected directly to inputs on 74HC and 74LS logic chips. Looking at it with my scope, it appeared that the AVR was unable to pull the input on the logic chip completely low ? It wo
2006-04-02 by fnatmed
--- In AVR-Chat@yahoogroups.com, "Leon Heller" wrote: > > ----- Original Message ----- > From: "fnatmed" > To: > Sent: Sunday, April 02, 2006 4:06 PM > Subject: [AVR-Chat] AVRFreaks.net down ? > > > > Hey - > > > > Anyone else having trouble getting in ? I keep getting : > > > >
2006-04-02 by Leon Heller
----- Original Message ----- From: "fnatmed" To: Sent: Sunday, April 02, 2006 4:06 PM Subject: [AVR-Chat] AVRFreaks.net down ? > Hey - > > Anyone else having trouble getting in ? I keep getting : > > Fatal error: Cannot redeclare class benchmark_profiler > in /usr/local/share/pea
2006-04-02 by Thomas Keller
Kathy Quinlan wrote: > AT76C712 is a cut down AVR 2 8 bit ports, a few 3 bit ports and a USB > node :) > > BUT HEY 48Mhz this could be the answer to some projects :) > http://www.atmel.com/dyn/products/product_card.asp?family_id=655&family_name=USB+Controllers&part_id=3579 > Good
2006-04-02 by Filipe Pereira
same thing..
2006-04-02 by ufo2joe
Yup. me too. Went down sometime yesterday and I just tried again now. Looks like a bug in the code somewhere(?) --- In AVR-Chat@yahoogroups.com, "fnatmed" wrote: > > Hey - > > Anyone else having trouble getting in ? I keep getting : > > Fatal error: Cannot redeclare class benchma
2006-04-02 by David VanHorn
You can see the circuit here http://www.potemkin.org/uploads/Pid/arduino_rs232_v2.png Ok, the URL didn't wrap properly. 10k pullup on reset is maybe a problem, maybe not. 1K would be better, and I'd advise a small cap from reset to ground, maybe 0.1uF The xtal caps are a bit smal
2006-04-02 by fnatmed
Hey - Anyone else having trouble getting in ? I keep getting : Fatal error: Cannot redeclare class benchmark_profiler in /usr/local/share/pear/Benchmark/Profiler.php on line 62 Dean.
2006-04-02 by Geo
On 1 Apr 2006, at 23:03, Henry Carl Ott wrote: > At 07:56 AM 3/31/2006, you wrote: > >Hello there > > > > > >I'm having some weird issues with an Atmega8 based board where the > >processor won't start the program unless the > >avrisp dongle is connected. > > > > > >You can see th
2006-04-02 by David VanHorn
On 4/2/06, Zack Widup w9sz@prairienet.org > wrote: Heehee - I think of it as the other way around. True, but they'll figure that out when they get here.
2006-04-02 by David VanHorn
Is turning away from PICs in favor of AVRs still refered to as going over to the dark side? I hope so, I coined the term on the piclist.
2006-04-02 by Jon & Tammy
Dave VanHorn wrote: >http://www.stickergiant.com/Merchant2/merchant.mvc? >screen=PROD&product_code=ssw26&category_code=cstar > > > > > > > > well I can make some if you really want'em Jon http://www.budget.net/~signjon/ATMEL.jpg http://www.budget.net/~signjon/Home.htm -- 109 Mard
2006-04-02 by Stefan Wimmer
--- In AVR-Chat@yahoogroups.com, John Samperi wrote: > > M168 (?) and M8 are pin compatible. ...so are M48 and M88. It's nice to be able to use a PCB for a whole series (M8, M48, M88, M168) of processors. Scroll down to the last entry on this page for an example: http://www.raket
2006-04-02 by David VanHorn
But still only a couple of I/Os!!! When will they get a clue?
2006-04-02 by Zack Widup
Heehee - I think of it as the other way around. Zack On Sat, 1 Apr 2006, Henry Carl Ott wrote: > At 09:11 PM 4/1/2006, you wrote: > >http://www.stickergiant.com/Merchant2/merchant.mvc? > >screen=PROD&product_code=ssw26&category_code=cstar > > > > > Is turning away from PICs in fa
2006-04-02 by Russell Shaw
Kathy Quinlan wrote: > Henry Carl Ott wrote: > >>At 09:11 PM 4/1/2006, you wrote: >> >>>http://www.stickergiant.com/Merchant2/merchant.mvc? >>>screen=PROD&product_code=ssw26&category_code=cstar >>> >>Is turning away from PICs in favor of AVRs still refered to as going over >>to t
2006-04-02 by Alex Gibson
Laiq Ahmed wrote: > Dear all > I am searching for such a SBC, i need 3 serial ports, > 10.4" or 12" COLOR TFT LCD interface & controller > builtin, flash & RAM for programming & memory,2 spi& > some Digital I/O. > But my main requirements are Color TFT & embedded > system not WIN
2006-04-02 by Kathy Quinlan
AT76C712 is a cut down AVR 2 8 bit ports, a few 3 bit ports and a USB node :) BUT HEY 48Mhz this could be the answer to some projects :) http://www.atmel.com/dyn/products/product_card.asp?family_id=655&family_name=USB+Controllers&part_id=3579 Also check out the Pico Power range :
2006-04-02 by Kathy Quinlan
Henry Carl Ott wrote: > At 09:11 PM 4/1/2006, you wrote: >> http://www.stickergiant.com/Merchant2/merchant.mvc? >> screen=PROD&product_code=ssw26&category_code=cstar >> > > > Is turning away from PICs in favor of AVRs still refered to as going over > to the dark side? > > > carl
2006-04-02 by Henry Carl Ott
At 09:11 PM 4/1/2006, you wrote: >http://www.stickergiant.com/Merchant2/merchant.mvc? >screen=PROD&product_code=ssw26&category_code=cstar > Is turning away from PICs in favor of AVRs still refered to as going over to the dark side? carl -------------------------------------------
2006-04-02 by Henry Carl Ott
At 07:56 AM 3/31/2006, you wrote: >Hello there > > >I'm having some weird issues with an Atmega8 based board where the >processor won't start the program unless the >avrisp dongle is connected. > > >You can see the circuit here > > > >do you have any suggestions? >thanks! Is the
2006-04-02 by James Hatley
Dave, The link has been cut in the middle ... you have to copy and paste the two pieces together. I couldn't see anything wrong unless R5 hasn't been installed. Jim ----- Original Message ----- From: David VanHorn To: AVR-Chat@yahoogroups.com Sent: Saturday, April 01, 2006 5:00 P