Peripherals; Led; Mechanical Switch; Crystal - Microchip Technology ATmega4809 Curiosity Nano User Manual

4.2

Peripherals

4.2.1

LED

There is one yellow user LED available on the ATmega4809 Curiosity Nano kit 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
ATmega4809 Pin
PF5
4.2.2

Mechanical Switch

ATmega4809 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).
Info: There is a 100 kΩ pull-up resistor connected to the generic user switch. An internal pull-
up in the ATmega4809 is not required to use the switch.
Table 4-2. Mechanical Switch
ATmega4809 Pin
PF6
4.2.3

Crystal

The ATmega4809 Curiosity Nano board has a 32.768 kHz crystal mounted.
The crystal is connected to the ATmega4809 by default, but the GPIOs are routed out to the edge
connector through not mounted resistor footprints. The two I/O lines routed to the edge connector are
disconnected by default to both reduce the chance of contention to the crystal as well as removing
excessive capacitance on the lines when using the crystal. To use the pins PF0 and PF1 as GPIO on the
edge connector, some hardware modification is needed. Solder a 0 Ω resistor or add a solder blob to the
footprints to connect the routing. The crystal should be disconnected when using the pin as GPIO, as this
might harm the crystal.
The 32.768 kHz crystal on ATmega4809 Curiosity Nano is a Kyocera Corporation
ST3215SB32768C0HPWBB 7 pF crystal.
The crystal has been formally tested and matched to the ATmega4809 by Kyocera. The test report is
available in the design documentation distributed with this document for ATmega4809 Curiosity Nano.
Info: Kyocera Crystal Device Corporation crystals that are matched with specific products can
be found on their website:
©
2018 Microchip Technology Inc.
ATmega4809 Curiosity Nano
Function
Yellow LED0
Description
User switch (SW0)
http://prdct-search.kyocera.co.jp/crystal-ic/?p=en_search/
User Guide
Hardware User Guide
Shared Functionality
Edge connector
Shared Functionality
DBG3
DS50002804A-page 15