User guide

Atmel AVR2054
5
8390B-AVR-12/11
2.1 Serial interface
Table 2-1 describes default serial interfaces used by the embedded bootloader to
upload firmware images. The interface settings may be changed in the
configuration.h file of the embedded bootloader application (see Section 3.3).
Table 2-1. Default serial port settings for embedded bootloader.
Platform (Atmel) Default port Comment
ATxmega256A3/D3 on
STK600 and REB-CBB
(REB2xxED-EK) USART0 on port D
For STK600, connect RXD/TXD
connectors with PD2/PD3 pins,
connect to PC via RS232
ATmega128RFA1 on
STK600
USART1
Connect RXD/TXD connectors with
PD2/PD3 pins, connect to PC via
RS232
ATmega128RFA1 on Red
Key Remote Control Board
(ATRF4CE-EK)
USART0
ATmega128RFA1 on
Sensor Terminal Board
(ATRF4CE-EK)
USB_FIFO
ATmega128RFA1 on
RCB-BB(ATRF4CE-EK)
USART1
ATmega1281/2561
(MeshBean) USART1
For MeshBean and RCB attached to
an expander board, connect the
board to a PC via the USB port
AT91SAM3S4C
(deRFusb-23E00)
USB DFU
For USB sticks, attach the device to
the USB port on a PC
2.2 Fuse bits settings
NOTE This section does not consider SAM3S, since this MCU does not have fuse bits.
Embedded bootloader firmware (if not yet loaded to a device) shall be uploaded over
the JTAG or ISP interface. Fuse bits must be configured correctly.
Recommended fuse bits for supported AVR microcontrollers are given in Table 2-2,
and fu
se bits for supported XMEGA microcontrollers are given in Table 2-3. T
he
tables enumerate all fuse bits and show the resulting fuse bytes.
Table 2-2. Fuse bits on ATmega1281 and ATmega128RFA1.
Option
Common
bootloader
OTAU bootloader for Atmel
BitCloud applications
Bootloader for RF4CE
applications
BODLEVEL Disabled Disabled
Brown-out detection at
VCC = 1.8V
OCDEN Disabled Disabled Disabled
JTAGEN Enabled Enabled Enabled
SPIEN Enabled Enabled Enabled
WDTON Disabled Disabled Disabled
EESAVE Disabled Disabled Enabled