Atmega128 - JTAGmkII problem

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Hi all,

Am using Atmega128 MCU. I have connected JTAGmkII with the MCU and tried reading the Signature bytes and Fuse bytes. Everytime when i do the reading the bytes are read to be 0x3F 0x3F 0x3F. When i tried programming the device, during verification of the flash it fails.

I dont know what could be the reason. Has anyone experienced like this before.

I dont know whether the JTAG fuse is enabled in the MCU or not. But i guess it would be enabled since the JTAGmkII is able to read something.

-Krishna Balan S

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"Heroes are ordinary people with extraordinary commitment"

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Quote:
I have connected JTAGmkII with the MCU
How? In which mode?

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly