Microchip Technology ATmega4809 Xplained Pro, Manual

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4.2.3 AVR
®
Debugger Connector
ATmega4809 Xplained Pro has a 10-pin 50-mil AVR Debug Connector ( J202 ) with UPDI that can be used to attach
external debuggers to the ATmega4809. Microchip debugging tools like the Atmel-ICE and Power Debugger can
connect directly to this connector.
Table 4-5. AVR
®
10-Pin Debugger Connector
AVR
®
10-Pin Debugger
Connector Pin
Pin/Net Function Shared Functionality
1 [TCK] — — —
2 [GND] GND Ground —
3 [TDO/UPDI] UPDI UPDI programming/debug EDBG
4 [VTG] VCC_TARGET ATmega4809 voltage —
5 [TMS] — — —
6 [nSRST] PF6 ATmega4809 reset signal SW1 , EXT1 , EDBG
7 [NC] — — —
8 [nTRST] — — —
9 [TDI] — — —
10 [GND] GND Ground —
Info: PF6 (RESET) is usually not used by external debuggers as the ATmega4809 can be reset through
the UPDI interface. If the debugger requires the use of the RESET, pin PF6 has to be configured as
RESET with a fuse in the ATmega4809.
4.3 Peripherals
4.3.1 Crystals
ATmega4809 Xplained Pro has a 32.768 kHz crystal that can be used as clock source for the ATmega4809 device.
There are cut-straps located close to the crystals that can be used to measure the oscillator safety factor. This is
done by cutting the strap and adding a resistor across the strap. More information about oscillator allowance and
safety factor is available in the
AVR4100 application note.
There is a 7 pF, 32.768 kHz crystal in a 3.2 mm by 1.5 mm package mounted on ATmega4809 Xplained Pro.
Table 4-6. External 32.768 kHz Crystal
ATmega4809 Pin Function
PF0 XIN32
PF1 XOUT32
Related Links
2.2 Design Documentation and Relevant Links
4.3.2 Mechanical Buttons
ATmega4809 Xplained Pro has two mechanical buttons. Both buttons are connected to I/O-pins on the ATmega4809
and can be used as general purpose buttons in the application. When a button is pressed, it will drive the I/O line to
GND.
ATmega4809 Xplained Pro
Hardware User Guide
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2020 Microchip Technology Inc.
User Guide
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