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AVR364
6.5 Board controller
The Atmel AT32UC3B1256 board controller and the Atmel ATmega1284P 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 6-2. ATmega1284P and board controller communication interface.
Interface
ATmega1284P pin
Atmel AT32UC3B1256 pin
UART RX
UART TX
TWI SCL
TWI SDA
(1)
(1)
PD2
PD3
PC0
PC1
PA24
PA23
PA09
PA10
SPI SS
(2)
PB4
PA16
SPI MOSI
(2)
PB5
PA14
SPI MISO (2)
PB6
PA25
SPI SCK
(2)
PB7
PA17
Notes:
1. This represents the RX and TX on the ATmega1284P . The RX is connected to
TX on the other device, and vice versa.
2. These signals can be disconnected from the board controller by cutting the cut-
straps marked SPI on the bottom side of the board.
11
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