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.
| 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.