Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Fiche De Données
Codes de produits
ATSAMD21-XPRO
Atmel SAM D21 Xplained Pro [USER GUIDE]
42220A-MCU-02/2014
12
cutting the strap and adding a resistor across the strap. More information about oscillator allowance and safety
1
.
Table 4-4. External 32.768kHz Crystals
Pin on SAM D21
Function
PA00
XIN32
PA01
XOUT32
4.2.2
Mechanical Buttons
SAM D21 Xplained Pro contains two mechanical buttons. One button is the RESET button connected to the
SAM D21 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 4-5. Mechanical Buttons
Pin on SAM D21
Silkscreen text
RESETN
RESET
PA15
SW0
4.2.3
LED
There is one yellow LED available on the SAM D21 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 4-6. LED Connections
Pin on SAM D21
LED
PB30
Yellow LED0
4.2.4
USB
The SAM D21 Xplained Pro has a micro USB receptable for use with the SAM D21 USB module. To be able to
detect when a USB cable is connected, a GPIO is used to detect the VBUS voltage on the connector. The USB
ID line is used to detect if a host mode cable is connected and will automatically switch on the power to the
USB connector. The I/O connected to USB ID can be used to read the status of the line or manually override
the voltage output. For other modes on the USB ID lines, refer to the USB organization specifications.
Table 4-7. USB Connections
Pin on SAM D21
USB
PA14
VBUS Detection
PA03
USB ID
PA24
USB D-
PA25
USB D+
4.2.5
Serial Flash
The SAM D21 Xplained Pro has an onboard 8Mbit serial flash for non-voltatile storage of data.
Table 4-8. Serial Flash Connections
Pin on SAM D21
Function
Serial Flash
Shared functionality
PA13
GPIO
#CS
EXT3 PIN8 (default
disconnected)
PB22
SERCOM5 PAD[2] SPI MOSI
SI
EXT3 and EDBG
PB16
SERCOM5 PAD[0] SPI MISO
SO
EXT3 and EDBG
PB23
SERCOM5 PAD[3] SPI SCK
SCK
EXT3 and EDBG
1