Boardcontroller

The boardcontroller and the Atmel ATmega1284P are connected together through TWI, SPI and USART. All interfaces can be used to communicate between the devices, but only the USART is implemented by default in the boardcontroller.

Table 1. Atmel ATmega1284P and boardcontroller communication interface
Interface Atmel ATmega1284P pin Atmel AT32UC3B1256 pin
UART RX1 PD2 PA24
UART TX1 PD3 PA23
TWI SCL PC0 PA09
TWI SDA PC1 PA10
SPI SS2 PB4 PA16
SPI MOSI2 PB5 PA14
SPI MISO2 PB6 PA25
SPI SCK2 PB7 PA17
1

This represents the RX and TX on the Atmel ATmega1284P. The RX is connected to TX on the other device and visa versa

2

These signals can be disconnected from the boardcontroller by cutting the cut-straps marked SPI on the bottom side of the board