Mega256x <--> JTAG ICE ???

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#1
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AVR Studio does not support the new 256x Megas via JTAG ICE (mkII only). Anyone knows the reason? There is a chance for an upcoming update??? Thanks for any information... !

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amsel77 wrote:
Anyone knows the reason?

To encourage you to buy a mkII perhaps?

Cliff

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Hi Cliff,

perhaps. BUT- this you can read in JTAG ICE user's guide: "Supports all AVR Devices with JTAG Interface". Mega256x including JTAG Interface should be possible - correct ?

jan

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amsel77 wrote:
BUT- this you can read in JTAG ICE user's guide: "Supports all AVR Devices with JTAG Interface".

But didn't that manual pre-date the 2560 ? So that was probably true when it was written.

The most up to date documentation for Atmel tools is always to be found in the AVR Studio help files and for the original JTAG it says:

Quote:
Currently the JTAGICE supports the following devices:

ATmega16(L), ATmega162(L), ATmega169(L or V), ATmega32(L), ATmega323(L), ATmega64(L), ATmega128(L).

Cliff

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Should be. Maybe even could be. But Atmel has stopped maintianing the original JTAGICE firmware. So new devices are very unlikely to ever be supported.

Heck... if you had access to documentation of the JTAG op-codes which are used to communicate between the JTAGICE and the ATmega, then you wouldn't even need any JTAGICE at all... you could just write PC software to communicate through some bit-wiggling LPT JTAG adaptor, and send the results to your favourite integrated debugging front-end software.

(BTW, that sort of thing is already possible for Flash, EEPROM and Fuse/Lockbit programming through the JTAG port... It's just the OCD-related JTAG instructions that Atmel has kept private.)