User's Manual

10
Atmel AVR2042
8334A-AVR-05/11
Table 5-7. PORTE header connection.
Header PORTE
ATxmega256A3
1
PE0 (62)
2
PE1 (63)
3
PE2 (64)
4
PE3 (1)
5
PE4 (2)
6
PE5 (3)
7
8
9
GND
10
VTG
Table 5-8. PORTF header connection.
Header PORTF
ATxmega256A3
1
PF0 (62)
2
PF1 (63)
3
PF2 (64)
4
PF3 (1)
5
PF4 (2)
6
PF5 (3)
7
PF6 (4)
8
PF7 (5)
9
GND
10
VTG
5.5 Serial flash
The Atmel REB-CBB is populated with a 2MB serial flash device (Atmel
AT25DF041A) for persistent data storage. It is capable of storing one complete
firmware image of the Atmel ATxmega256A3, which makes it suitable for over-the-air
upgrades (OTA). It is connected to SPID PD4..7.
Table 5-9. Serial flash connection.
ATxmega256A3
AT25DF041A
PD4 (30)
#CS
PD5 (31)
SI
PD6 (32)
SO
PD7 (33)
SCK
The AT25DF041A supports SPI frequencies of up to 50MHz at supply voltages down
to 2.3V. When operating the board below 2.3V, the serial flash cannot be accessed,
see datasheet [3] for more information.