User's Manual

Atmel AVR2042
11
8334A-AVR-05/11
Table 5-10. AT25DF041A ordering information.
Ordering code
Flash
Maximum freq.
Power supply
Package
Temperature
AT25DF041A
256KB + 8KB
50MHz
2.3V – 3.6V
8S1 SOP-8
-40°C – 85°C
5.6 UART/USART
The signal lines for asynchronous serial operation, using USARTD0, of the Atmel
ATxmega256A3 are connected to header USARTD0. In addition, the MCU reset line
is connected to pin 5 of this header. This can be used to work with a serial boot
loader. No level conversion is done; therefore, an external RS232/TTL conversion
circuit is required.
The header pin-out mates with the available RS232/TTL converter (art. no. de28560).
Table 5-11. Connection of USARTD0.
ATxmega256A3
Header USARTD0
Description
PD2 (28)
RxD (4)
Asynchronous serial in
PD3 (29)
TxD (1)
Asynchronous serial out
RESET (57)
RESET (5)
MCU reset
VTG (2)
Operating Voltage
GND (6)
Ground
Synchronous operation is not supported at this connector since the clock line at
PD1(27) is already in use to control the TXCW pin when AT86RF230 is connected.
However, in addition all interface pins for USARTE0 and USARTF0 are accessible for
all operating modes including SPI.