Atmel SAM4N Xplained Pro, User Manual

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Atmel SAM4N Xplained Pro [USER GUIDE]
42104A-MCU-06/2013
12
Pin on SAM4N Function
PA8 XOUT32
Table 4-8. External 12MHz crystals
Pin on SAM4N Function
PB9 XIN
PB8 XOUT
4.2.2 Mechanical buttons
SAM4N Xplained Pro contains two mechanical buttons. One button is the RESET button connected to the
SAM4N reset line and the other is a generic user configurable button. When a button is pressed it will drive the
I/O line to GND.
Table 4-9. Mechanical buttons
Pin on SAM4N Silkscreen text
NRST RESET
PA30 SW0
4.2.3 LED
There is one yellow LED available on the SAM4N Xplained Pro board that can be turned on and off. The LED
can be activated by driving the connected I/O line to GND.
Table 4-10. LED connections
Pin on SAM4N LED
PB14 Yellow LED0
4.2.4 Analog reference
The ADVREF is available on a 2-pin header to measure the analog reference voltage of the SAM4N device.
Note The ADREF pin can only be used for measuring and must not be used as an input for an external
voltage reference.
4.3 Embedded Debugger implementation
SAM4N Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and debug the
ATSAM4N16C using Serial Wire Debug (SWD). The Embedded Debugger also include a Virtual Com port
interface over UART, an Atmel Data Gateway Interface over SPI and TWI and it monitors four of the SAM4N
GPIOs. Atmel Studio can be used as a front end for the Embedded Debugger.
4.3.1 Serial Wire Debug
The Serial Wire Debug (SWD) use two pins to communicate with the target. For further information on how to
use the programming and debugging capabilities of the EDBG, see “Embedded Debugger” on page 6 .
Table 4-11. SWD connections
Pin on SAM4N Function
PB7 SWD clock
PB6 SWD data
PB5 SWD trace output
PB12 Erase
4.3.2 Virtual COM port
The Embedded Debugger act as a Virtual Com Port gateway by using one of the ATSAM4N16C UARTs. For
further information on how to use the Virtual COM port see “Embedded Debugger” on page 6 .