In addition to the Xplained Pro Standard Extension Headers, ATmega256RFR2 Xplained Pro has additionally two headers with spare
signals which offers access to the I/O of the microcontroller which are otherwise not
easily available elsewhere or might be favorable to have collected together. All headers
have a pitch of 2.54mm.
Table 1. SPARE ADC Signals
HeaderPin on header |
ATmega256RFR2 pin |
Function |
Shared functionality |
1 |
- |
VCC (3.3V) |
|
2 |
PF4 |
ADC4(1) |
JTAG Interface, TCK |
3 |
PF5 |
ADC5(1) |
JTAG Interface, TMS |
4 |
PF6 |
ADC6(1) |
JTAG Interface, TDO |
5 |
PF7 |
ADC7(1) |
JTAG Interface, TDI |
Note: - 1.These lines are connected to the JTAG interface, and ADC will not work properly while debugging or programming the kit.
Table 2. SPARE Signals Header
2Pin on header |
ATmega256RFR2 pin |
Function |
Shared functionality |
1 |
AREF |
Analog reference |
|
2 |
TST |
Test pin for RF test mode |
|
3 |
RSTN |
Reset |
EDBG and RESET button |
4 |
RSTON |
Reset status |
|
5 |
CLKI |
Alternative main clock input |
|
6 |
|
GND |
|