Chameleon-AVR Nurve Networks, Chameleon-AVR Datasheet - Page 261

• Manufacturer Part Number: Chameleon-AVR
• Description: MCU, MPU & DSP Development Tools AVR8 & PROPELLER DEV SYSTEM (SBC)
• Manufacturer: Nurve Networks

Specifications of Chameleon-AVR

• Processor To Be Evaluated: AVR 328P
• Data Bus Width: 8 bit
• Interface Type: USB, VGA, PS/2, I2C, ISP, SPI
• Operating Supply Voltage: 3.3 V, 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

© 2009 NURVE NETWORKS LLC “Exploring the Chameleon AVR 8-Bit”
Appendix D - Using the AVR in "Stand-Alone" Mode.
The nice thing about the Chameleon is that its two systems in one. You are free to use the AVR as you wish and not
worry about the Propeller chip. However, whatever driver that is on the Propeller will run and function independently even
though, you aren’t sending it commands over the SPI channel. Thus, if you truly want to turn off the Propeller, you might
want to load a NULL program that does absolutely nothing such as:
This will start up a single processor, and just sit and do nothing. Of course, without the Propeller, you have no access to
the physical peripheral headers such as the A/V headers, VGA, or the PS/2 header. But, you still have access to the USB
serial port as well as the FLASH memory. And of course, all the headers connected to the AVR around the board you still
have access to. Just make sure to keep the serial select switch in the DOWN position, so the AVR has access to the
USB serial port.
Appendix E - Using the Propeller in "Stand-Alone" Mode.
The Propeller in stand alone mode is much more interesting that the AVR. The Propeller in stand alone mode allows you
to more or less run anything you would run on a HYDRA or Propeller Development kit still. You have the VGA connector,
PS/2, A/V connectors as well as an 8-bit port for expansion. You might have to do some “porting” of apps since the
HYDRA and Propeller development kits use slightly different pin I/O connections for various devices, but those are literally
1-2 line changes in your code.
The only thing you loose in Propeller stand alone mode is the use of the onboard FLASH since the Propeller can’t get to it,
but the EEPROM for the Propeller is 64K, 2x the amount needed for the boot image, so that’s a conciliation prize in the
design, if you need more assets. Just make sure to keep the serial select switch in the UP position, so the Propeller has
access to the USB serial port.
261