Why ATMega8 is not supported by JTagICE?

Hi,

Do anyone know why Atmel ATMega8 is not supported by JTagICE?

Thanks!

In article <9904d48.0407102024.3392b119@posting.google.com>, terry
<leonlai2k@yahoo.com> writes
>Hi,
>
>Do anyone know why Atmel ATMega8 is not supported by JTagICE?
>
>Thanks!

Because there are perfectly good ICE for it.

JTAg is run control, Flash programming and board test. It is not an
Emulator. 

It requires a JTAG block and debug block on the silicon. this tames
space and power. It also costs to implement

On a small 8 bit system there is no gain on having a JTAG unless it is
going in an ASIC or FPGA

 

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\/\/\/\/\ Chris Hills  Staffs  England    /\/\/\/\/\
/\/\/ chris@phaedsys.org       www.phaedsys.org \/\/
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"terry" <leonlai2k@yahoo.com> wrote in message
news:9904d48.0407102024.3392b119@posting.google.com...
> Hi,
>
> Do anyone know why Atmel ATMega8 is not supported by JTagICE?
>
> Thanks!

The JTagICE needs a JTAG port.  The ATMega8 does not have a JTAG port.

Cheers,
--
Alf Katz
alfkatz@remove.the.obvious.ieee.org

On 10 Jul 2004 21:24:56 -0700, leonlai2k@yahoo.com (terry) wrote:

>Hi,
>
>Do anyone know why Atmel ATMega8 is not supported by JTagICE?
>
>Thanks!

Not enough pins.
If you need this functionality for development, use a mega16 on th eprototype and switch to mega8 on
production boards.