Overview
Atmel
®
encourages the use of this kit to develop a prototype platform for evaluation of
the intended application. The source code is included in the CD with the kit, but for the
latest revision please check the Atmel web site (www.atmel.com) for new releases.
This kit was designed to make modification or upgrading the firmware a very simple
and quick process. The kit accepts two very common programming interfaces, ISP
and JTAG. Firmware v3.0 and later will also allow re-programming via the serial port.
Tools needed for firmware upgrade:
•
AVR Studio
®
4
•
Programmer (AVRISP MKII, JTAGICE MKII, STK
®
500)
Tool needed to develop firmware:
•
AVR Studio 4
•
WinAVR
•
Programmer (JTAGICE MKII, AVRISP MKII, STK500)
Fuse Settings:
Fuse bits must be set properly for the kit to function. The only fuse bits that should be
set are listed below.
•
JTAG Interface Enabled; (JTAGEN=0)
•
Serial program downloading (SPI) enabled; (SPIEN=0)
•
Boot Flash section size=1024 words Boot start address=$FC00; (BOOTSZ=10)
•
Boot Reset vector Enabled (default address = $0000; (BootRST=0)
•
Brown-out detection level at VCC=2.7V; (BODLEVEL=1)
•
Int. RC OSC. 8MHz; Start-up time; 6CK + 64ms; (CKSEL=0100 SUT=10)
All others should be unchecked
These fuses can be programmed using the tools described below. This only needs to
be preformed once. Subsequent flashing of the memory does not affect the fuse set-
tings. Fuse settings should only be modified if the change is well understood. For
example, changing the clocking from Int. RC OSC to external could render the device
unusable without extensive work. Or removing the SPI enabled fuse setting could
make programming impossible without using a second tool.
ISP Programming
ISP is a downloading method where only six I/O lines are needed. The provided
header works with the ATSTK500 as well as the AVR ISP In-System Programmer
(ATAVRISP MKII). Both of these are available from Atmel or distributors for very low
cost program development.
AVR based
125kHz RFID
Evaluation Kit
(Re)Programming
Guide
ATA2270-EK1
5241A–RFID–12/07