ATMEGA128  Development Board

A complete operational single board computer based on the powerful Atmel ATMEGA128 microcontroller.  All of the basic features required are included and all useful pins are brought out to two 32 pin headers.
 

I have fallen in love with the ATMEL AVR series. Heres why!

ATMEGA128-16AC  Summary data sheet.  Full data sheet.

The ATMEGA128 has 128-Kbyte self-programming Flash Program Memory, 4-Kbyte SRAM, 4-Kbyte EEPROM, 8 Channel 10-bit A/D-converter. JTAG interface for on-chip-debug. ISP programming interface.  Up to 16 MIPS throughput at 16 Mhz.

If you are new to the AVR then I would recommend a visit to Atmels Web site and AVRFreaks.  Take a look at Getting Started with the ATMEGA128.  Take a look here re getting GCC operational with the 128 and here Getting Started with The AVR.

Program with an ISP programmer or via the JTAG interface.  Use your STK-500 or any other low cost ISP programmer.  I use both PonyProg with a homebuilt parallel port programmer and Atmels AVR ISP and they both work fine.

Development board features:

• Atmel ATMEGA128-16AC microcontroller (other variants - inquire)
• 14.7456 MHz crystal in socket for easy replacement. Why not 16 MHz?
• 32.768 KHz oscillator for use as RTC
• Reset button
• RS-232 interface good to 250 KBaud  using a MAX221,  with receive jumper disconnect, D-Sub 9 pin female connector.
• ISP interface - 6 pin for programming
• JTAG interface - 10 pin for programming / debugging (not yet tested - need feedback!)
• 78M05 regulator, good for 500 mA at 5 volts with 7 to 30 volts input, or feed external regulated 5 VDC power via either 32 pin header.
• Power jack (2.0 mm pin, center positive) - plug a 7 to 30V DC wall wart directly into the board
• Power LED
• Power disconnect jumper for board current draw testing
• Run LED connected to PD5
• Ground test point
• Proper analog supply with inductor and capacitor filtration
• Spare 28 TSSO surface mount device pattern
• Two 32 pin headers on 1.5" spacing connecting most CPU pins.
• Above board pin extensions for attaching scope probes, jumpers or a wire-wrap.
• Board dimensions 1.75" x 2.85"

Board Schematic (.pdf format)
Power Consumption Discussion

ATMEGA128 Development board
       P/N AM128  -  $65 US 

As described above, assembled and tested.  Comes with instructions, schematic and pin-out list,  test program in flash, CD with development software and sample programs, 14.7546 MHz crystal (if you prefer a 16MHz instead please indicate in notes).

Extra crystals  -  P/N XTL  -  $2.00 ea.
            Specify 8, 14.7546 or 16 MHz in notes. 

Breadboard Adapter - P/N BBAdapt1  -  $10 US 
    Plug your module into your breadboard - 2 x 16 pins on .300" spacing

Wire wrap Adapter, 2 x 16 pin
      P/N WWAdapt1  -  $10 US 

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