Preprogrammed Lock Bits
The following lock bit is preprogrammed to protect the bootloader from accidental overwrites.
1. Boot Loader Protection Mode 2: SPM prohibited in Boot Loader Section
Note:
The only way to erase this bit is to use JTAG ICE mkII or AVR ISP and run an erase cycle of
the flash using AVR Studio. See figure 20.
Figure 20: AVR Studio Lock Bits Window
JTAG ICE or JTAG ICE mkII
The CC2420DB provides a connector for the JTAG ICE programmer to communicate with
AVR Studio. This interface can be used to debug or download source code using Coff files or
hex files. The JTAG connector is P10. The Coff files are built using the make file option,
make extcoff. See the make file enclosed with our software example for details.
Step-by-Step procedure:
1. Connect JTAG ICE to connector P10 on CC2420DB. Please refer to figure 20 for
location of the connector
2. Connect power to CC2420DB
3. Disable
the
Boot Reset Vector Enabled
fuse
Chipcon AS
SmartRF
®
CC2420DBK Demonstration Board Kit User Manual
(rev. 1.3) 2004-11-03 Page 33/ 52
