"Graham Davies" <[EMAIL PROTECTED]> wrote: >> Q2: since there are Mk1 clones, are there mk2 clones ?
> I don't know of any. I don't think Atmel have released any > information about DebugWIRE and I haven't come across any reverse > engineering of the Atmel Mark II. Well, the mkI has been reverse-engineered (the hardware, the software not that much). But then, the mkI is internally much simpler than the mkII device (one ATmega16 plus stuff, compared to a couple of ATmega128 plus stuff, each running their own firmware). You can plug an mkI clone together on an STK500 used as a breadboard, and connect the `squid' cable (the one with the colored wires) to it as the JTAG interface. All you need in addition is a 7-dot-something crystal. > If so, why not restrict > yourself to AVRs with JTAG interfaces? AFICT, all the newer AVRs won't be supported by the mkI JTAG ICE anymore (regardless of whether you're going to use dW or JTAG). >> [the internal RC oscillator] is not accurate ... > I think you are right to insist on a crystal if you're using the > UART. For UART communication, the precision of the internal RC oscillator is sufficient. The only tricky thing is if you want to use it on Vcc other than 5 V, because the factory-shipped calibration values are all provided for 5 V only. For other voltages, you've got to find your own calibration method. -- cheers, J"org .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/ NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) _______________________________________________ AVR-chat mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/avr-chat
