Basic Atmega 644

Does anyone have schematics for a basic duino/atmega644 with nothing fancy like jtag or icsp?

those are built into the chip...

Well it depends if you want an off chip oscillator. The basic 644 is lot more available then the 644P with two serial ports. I would think 8mhz rather then 16mhz would be adequate for slave controllers.

If you use on chip oscillator you just have to fairly much provide a ground and VCC.

The tool chain for using with the chip would be a bit different at the binary level to use the Aurdino development environment.

Then it's matter of how you program the chip (back to jtag, iscp or getting an appropiate Aurdino bootstrap program loader onto the chip.)

I would suggest AVRFREAKS for further research as you have stepped out of the basic relm of RepRap.

Since this would be pure research on your part some things to look at are:

[www.embedds.com]
[www.chip45.com]

[macjordomo.fuortes.net]
[www.arduino.cc]
[www.robotcraft.ca]

[www.arduino.cc]

In initial reading of this it looks the key is F_CPU setting for CPU speed and recompiling the Aurdino core libraries and the bootstrap loader before doing an initial load of it onto the chip with jtag or icsp.

Report back what works for you.

Thanks for the info. I'm going to make it work but by no ICSP or JTAG I meant if anyone has the plans for atmega 644p board that has no JTAG or ICSP connectors.

Well you do have to have some way to get the bootstrap loader onto the chip and that is done with jtag or icsp. You could have temporary programming socket that programs the chip before it is loaded into the board.

I previously blogged about how to do that with a USB-TTL (5v) cable.

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