AVR-Chat

On Fri, Sep 12, 2008 at 05:10:12PM -0000, avrx123456789 wrote:
> I am looking for opinions on JTAG vs DebugWire.
> 
> I have an AT90USBKey which hosts an AT90usb1287.
> I would like to do single-step debugging on it.

What does your AT90usb1287 support? I am not aware of any AVR which
supports both JTAG and DebugWire, but that might be just my ignorance.

> I have found 2 programmers that claim to support it:
> 1. Atmel JTAG Mk II   at about $90 for a clone
> 2. Kee Electronics AVR Mk II Lite at about $48 
> http://www.keeelectronics.com/AVR_debugWire_ISP_v2.htm
> 
> The JTAG Mk II can debug my chip using JTAG.
> The Kee product says it will debug my chip using DebugWire.

If either is a real clone of the Atmel JTAGICE mk-II then it will do
both JTAG and DebugWire. Only $300 for The Real Thing(tm).

The AVR Dragon is very good with both JTAG and DW but only debugs on 32k
and smaller AVRs. Roughly $50 but you have to build your own cables.

-- 
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.