Important:
Once the pin headers are in place, they are hard to remove by hand. Use a set of pliers and
carefully remove the pin headers to avoid damage to the pin headers and PCB.
4.2
Peripherals
4.2.1
LED
There is one yellow user LED available on the AVR128DA48 Curiosity Nano Board that can be controlled by either
GPIO or PWM. The LED can be activated by driving the connected I/O line to GND.
Table 4-1. LED Connection
AVR128DA48 Pin
Function
Shared Functionality
PC6
Yellow LED0
4.2.2
Mechanical Switch
The AVR128DA48 Curiosity Nano has one mechanical switch. This is a generic user-configurable switch. When the
switch is pressed, it will drive the I/O line to ground (GND).
Tip:
There is no externally connected pull-up resistor on the switch. To use the switch, make sure that an
internal pull-up resistor is enabled on pin PC7.
Table 4-2. Mechanical Switch
AVR128DA48 Pin
Description
Shared Functionality
PC7
User switch (SW0)
4.2.3
Crystal
The AVR128DA48 Curiosity Nano board has a 32.768 kHz crystal mounted.
The AVR128DA48 is connected to the crystal by default, but the GPIOs are also routed to the edge connector
through two solder points. The two I/O lines routed to the edge connector are disconnected by default to reduce the
chance of an external signal causing contention with the crystal, and to remove excessive capacitance on the lines.
To use PF0 and PF1 as GPIO, some hardware modifications are required.
• Disconnect the crystal by cutting the two straps on the top side of the board next to the crystal (J210, J211). The
crystal should be disconnected when using the pin as GPIO, as this might harm the crystal.
• Connect the I/O lines to the edge connector by placing solder blobs on the circular solder points marked PF0
and PF1 on the bottom side of the board (J207, J208)
The cut straps and solder points can be seen in
Table 4-3. Crystal Connections
AVR128DA48 Pin
Function
Shared Functionality
PF0
TOSC1 (Crystal input)
PF1
TOSC2 (Crystal output)
AVR128DA48 Curiosity Nano
Hardware User Guide
©
2020 Microchip Technology Inc.
User Guide
DS50002971A-page 25
