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ATmega128 JTAG + Olimex JTAG

Discussion in 'Embedded' started by larwe, Dec 25, 2005.

  1. larwe

    larwe Guest

    Just a couple of quick questions about JTAG on the AVR series,
    specifically the mega128, and the Olimex USB JTAG ICE. I haven't used
    JTAG on AVR before.

    1. Any positive or negative comments on the AVR-USB-JTAG from Olimex
    vs. the JTAGICE from Atmel? It seems like the JTAGICE uses a
    higher-speed USB connection vs. serial emulation on the Olimex device,
    is that accurate?

    2. What do I do with pin 8 (nTRST) on the JTAG connector? Olimex's
    designs run this to a GPIO on the micro, but I don't see the reason for
    it. I also don't understand why Vref runs to the port, but that's a
    separate issue.

    larwe, Dec 25, 2005
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