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 1. 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
Parent topic: Peripherals
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 0Ω resistor or a solder drop on R408 and R409 footprints.

3

These SPI signals can be reconnected by placing a 0Ω resistor or a solder drop on R410, R411, R412, and R413 footprints.