User manual

Atmel AT02667: XMEGA-E5 Xplained Hardware User’s Guide [APPLICATION NOTE]
42084A−AVR−04/2013
11
Illuminance [lux] ADC input [V] Illuminance
500 1.1750 Office lighting
600 1.4100 Office lighting
700 1.6450 Office lighting
800 1.8800 Office lighting
900 2.1150 Office lighting
1000 2.3500 Overcast day
4.6 Board controller
The Atmel AT32UC3B1256 board controller and the Atmel ATxmega32E5 are connected through TWI, SPI, and
USART interfaces. All interfaces can be used to communicate between the devices, but only the USART is
implemented by default on the board controller.
Table 4-7. ATxmega32E5 and board controller communication interface.
Interface ATxmega32E5 pin Atmel AT32UC3B1256 pin
UART RX
(1)
PD6 PA24
UART TX
(1)
PD7 PA23
TWI SCL
(2)
PC1 PA09
TWI SDA
(2)
PC0 PA10
SPI SS
(3)
PC4 PA16
SPI MOSI
(3)
PC7 PA14
SPI MISO
(3)
PC6 PA25
SPI SCK
(3)
PC5 PA17
Notes: 1. This represents the RX and TX on the ATxmega32E5. The RX is connected to TX on the other device, and
vice versa.
2. These TWI signals can be reconnected by placing a 0 ohm resistor or a solder drop on R408 and R409
footprints.
3. These SPI signals can be reconnected by placing a 0 ohm resistor or a solder drop on R410, R411, R412
and R413 footprints