E.1 reb and rex_arm adaptor, Avr2070 – Atmel AVR2070 User Manual
Page 84
84
AVR2070
8240B-AVR-06/09
Appendix E - Third-Party Reference Designs / Platforms
This section describes various reference designs that can be purchased from
distributors like Dresden Elektronik (
www.dresden-elektronik.de
) and TRT
Technology (
www.trttech.com
). These platforms are supported within the RUM
source code for alternate evaluation and development options.
E.1 REB and REX_ARM Adaptor
The REB (Radio Extender Board) is designed to support evaluation of the standalone
transceiver and this board can be connected to an STK500/600 or the AT91SAM7X-
EK kit. Using the generic connection guide in section 4.2 will provide a method for
connecting the board to any evaluation kit of choice. The REB can also be connected
to the AT91SAM7X-EK board with a REX_ARM adapter board.
The Atmel IEEE 802.15.4 radios can be controlled via SPI and a few discreet IO
signal lines. Please refer to the respective datasheets for detailed information on the
radio – microcontroller physical connections. To separate the radio from the external
memories present or possible on the SAM7X board SPI-1 is used. The SAM7X is
connected to the AT86RF2xx family based on the following table. This table also
includes the REX_ARM adaptor board connections between the AT91SAM7X-EK and
the REB.
Table E-1 Signal Connections
ARM Adapter Board
AT91SAM7X-EK Board
REB Pin
SAM7X-EK
Header Pin
SAM7X
MCU Pin
Port Port
Function
MISO 27 A25 56
PA24
SPI1_MISO
MOSI 28 A24 55
PA23
SPI1_MOSI
SCK 29
A23
50
PA22
SPI1_SPCK
SEL 30
A22
49
PA21
SPI1_NPCS0
IRQ 38
C24
80
PA30
IRQ0
CLK1 17 C22 70
PB24
TIOB0
SLEEP_TR 26
A9
13
PA8 PA8
RST 25
A10
14
PA9
PA9
TXCW 24 A27 60
PA26
PA26
Note: Only needed
for AT86RF230
An example of using the AT91SAM7X-EK and the REB with the REX_ARM adaptor is
shown in the following pictures.