Looking for schematic of ATmega JTAG cable

I want to build a ATMEGA JTAG cable (compative JTAG ICE), I can't find out the schematic, help me .

jtag atmega

Below is a conv I had with someone about a week ago when I was buying an ISP programming cable for AVR
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I didn't list those on the description since it was only for you.

You'll get:

Long ISP cable
6-pin header
6-conductor Molex connector (same as on the cable, used to shorten the cable if you need to)
6 crimp on connectors (used to shorten the cable if you need to)
A few miscellaneous connectors and such to play with

I'll send this out on monday (not sure if Monday is a holiday though).

Thanks for the order!

Eddy

----- Original Message -----
From: Lee Leathers
To: Eddy Wright
Sent: Saturday, January 01, 2005 2:42 PM
Subject: Re: ISP programming cables


Alright, You have paypal.

When I purchased the item, in the description it didn't say anything about a 6-pin adapter header for to convert 5x2 into 6x1, nor the 6-pin header to turn the molex connector into a male connector.

Thanks for the help!
Lee



----- Original Message -----
From: Eddy Wright
To: Lee Leathers
Sent: Saturday, January 01, 2005 6:40 AM
Subject: Re: ISP programming cables


Yes, the cable is 20 feet long. In Bascom, select Options/Programmer then select the STK200/300 from the drop down list. Your parallel port needs to be in EPP or ECP mode for any programmer to work. You may have to go into your BIOS settings to check this. Next, hook up the cable to the microcontroller and make sure both the microcontroller and the cable have power. Now you can click on Program/Send to Chip to launch Bascom's built-in Programmer. It should automatically identify the chip you have. To change the fuse bits, click on the Lock and Fusebits tab. That should do it!

Here's a link to the item: http://www.wrighthobbies.net/catalog/product_info.php?cPath=27&products_id=55 .

Thanks for the business!

Eddy

----- Original Message -----
From: Lee Leathers
To: Eddy Wright
Sent: Friday, December 31, 2004 11:51 PM
Subject: Re: ISP programming cables


I think that is it! I have a couple of uCs already, so I am set on that.

I am confused on how to set the different fuses though through bascom with this cable... or do I have to use another program?

20' = 20feet, so the cable is 20feet?

But besides that, just tell me when it is up on your webpage, and I will buy it.

thanks-Lee



----- Original Message -----
From: Eddy Wright
To: Lee Leathers
Sent: Friday, December 31, 2004 10:14 PM
Subject: Re: ISP programming cables


Yes, in Bascom select the STK200 programmer and use the built-in programmer. I'm including the 6-pin header that will allow you to plug it into a breadboard. Do you need any AVR mcu's? I have the Mega32, Mega8, Tiny26 and Tiny13.

The pinouts are:

1 - Black connects to GND
2 - Red connects to +5V
3 - White connects to Reset
4 - Blue connects to MOSI
5 - Green connects to MISO
6 - Yellow connects to SCK

The pins on the MCU can vary based on the type of chip. This pinout works with the M8 and M32 but it's different on the Tiny mcu's. The datasheet shows where they connect.

The cable is actually very long - about 20'. I made it to reach from my PC to my workbench. I know it's not supposed to be that long but they way I see it, if it works, it works... I'll give you a set of replacement crimp pins so you can shorten it if you like (or if it gives you any errors due to the length of the cable, it might be susceptable to things like flourescent lights).

So far I'm packing up the long ISP cable, 6-pin adapter header for plugging into a breadboard, 6 spare crimp connectors. Anything else? I'll make this a grab bag on my web site and you can purchase it there.

Thanks!
Eddy

----- Original Message -----
From: Lee Leathers
To: Eddy Wright
Sent: Friday, December 31, 2004 7:34 PM
Subject: Re: ISP programming cables


You know what, I will just go ahead and buy the cable from you. How long is the cable? Do you sell/have a 6-pin header?

Right now, I don't have anything for the AVR line of uCs.. just a couple of uCs, so this cable will let me program, set fuses, and anytthing else I need, right?

Shipping will be to:
/edit/


thanks-Lee
----- Original Message -----
From: Eddy Wright
To: Lee Leathers
Sent: Thursday, December 30, 2004 8:01 PM
Subject: Re: ISP programming cables


You use a 6-pin header to turn the molex connector into a male connector. The header has the same length on the post and the tail so it can fit into a breadboard and plug into a molex connector. Here's a picture of the header (click the little picture to see a larger one):

http://www.wrighthobbies.net/catalo...id=48&osCsid=d577ac9350e22e91c2d646887b259b1b

Typically, everyone uses a 10-pin IDC connector which is a shrouded 5x2 header. I mentioned the 6-pin version since you wanted it to work in a bread board. double row headers don't play well on a breadboard.

Eddy

----- Original Message -----
From: Lee Leathers
To: Eddy Wright
Sent: Thursday, December 30, 2004 6:13 PM
Subject: Re: ISP programming cables


I do have one question.. the 6-pin molex would only be useful if I had a stk* board, right?

How would I use this with a breadboard? Would I need another adapter?

thanks-Lee


----- Original Message -----
From: Eddy Wright
To: Lee Leathers
Sent: Thursday, December 30, 2004 7:00 PM
Subject: Re: ISP programming cables


No problem, if you have any questions on making one, feel free to send an email.

Take care,

Eddy
----- Original Message -----
From: Lee Leathers
To: Eddy Wright
Sent: Thursday, December 30, 2004 3:47 PM
Subject: Re: ISP programming cables


man, that sounds like a great deal. Honestly I was just seeing if I could build one from scrap parts I have around the house.. because I am finishing up another project, and that project is taking up all my money :/

Thanks for the reply, but I am afraid I will have to pass.

thanks-Lee


----- Original Message -----
From: Eddy Wright
To: fredit@charter.net
Sent: Thursday, December 30, 2004 9:43 AM
Subject: ISP programming cables


Lee, I have an ISP cable that I used with the first generation of controller boards. It has the buffer chip so it works more reliably than the resistor only version. It has a long single stranded cable (12' or more) and terminates into a 6-pin Molex connector that connects to a breadboard using a header strip (included with the cable). Since I developed the new version of my controller board, I don't use this old version any more. I can sell you this one for $10 plus actual shipping. It emulates the STK200 and works great with Bascom.

Here's a picture of it: http://www.wrighthobbies.net/products/isp/isp.1.jpg

And here's the schematic (I changed the connector to the 6-pin molex): http://www.wrighthobbies.net/avr/ispdongle.pdf

I also have the standard ISP that uses the 10-pin ribbon cable and an adapter that convert the 2x5 connector to 1x6 (same as the cable above). If you buy one of these, I'll throw the adapter in for free.

Let me know if you're interested.

Thanks!
Eddy Wright
http://www.wrighthobbies.net
eddy@wrighthobbies.com

----- Original Message -----
From: Lee Leathers
To: bascom@grote.net
Sent: Wednesday, December 29, 2004 11:52 PM
Subject: [bascom] ISP programming cables


I was taking you'll advice and was going to make my own ISP cable.. but, after I bought some of the parts, and priced the cable out.. it seems like it would cost more to build it myself.. Here is the price breakdown:
parallel cup - $2
220ohm resistors $1
cable (6foot x7cablesx14cents (this was the cheapest I have found.. and I want single stranded so I can plug directly into my breadboard...) - 5.88$

so $8.88... well a little cheaper than some (others a lot cheaper).

Is my pricing way off? should I look to buy the wire elsewhere?


thanks guys!

Lee
----

Added after 4 minutes:

I would suggest reading through the above conv.. I got away with using an ISP.. instead of JTag ICE (they are VERY diff)...

I think the ISP is a great place to start (total was ~$14 shippeed.. so you cannot go wrong). And also.. it is pretty hard to justify building one, once you factor in your time.. but I guess it can be a good learning experience

The JTAG ICE.. I think* would be a GOOOOOD bit more

atmega32 jtag

What advantages does the ATMEGA JTAG cable give over a normal in-circuit programmer

atmega168 jtag

Whoops.. sorry. I was wrong about the pricing (well.. wrong by somepeople's standards..)

I saw a jtag cable

http://www.miklobit.com/JTAG_ICE.457+B6Jkw9Mw__.0.html
**broken link removed**

(they are the same.. just making sure you have atleast one valid link : ) )

This is 37bucks..

Afaik jtag's biggest benefit is incircuit debugging

Hope that helps
Lee

atmega48 jtag

other possibility is **broken link removed**
price 35EUR or diy

regards

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