Connecting The 32.768 Khz Crystal; Operation At Other Voltages - Microchip Technology ATtiny3217 Xplained Pro Manual

Figure 4-5. Assembly Drawing Bottom
4.5.1

Connecting the 32.768 kHz Crystal

The ATtiny3217 Xplained Pro board has a 32.768 kHz crystal mounted on the kit. The crystal is not connected by
default as the TOSC pins on the device are used for UART communication to the extension headers and the EDBG
CDC. To use the crystal, this connection has to be broken to get a functional crystal operation.
To connect the crystal, remove resistors R307 and R308 and place them on the footprints for R312 and R313. To
locate the components, see the assembly drawing in the section above (Kit Modifications).
Info: Operating the ATtiny3217 with the crystal requires physical modifications on the kit using a
soldering iron.
4.5.2

Operation at Other Voltages

The ATtiny3217 Xplained Pro board is operated at 3.3V by default, but it can also operate from other voltages from
an external supply. The EDBG is designed to run from a 3.3V supply and won't work on other voltages, therefore all
connections from the EDBG and the on-board 3.3V regulator to the ATtiny3217 should be removed.
To completely disconnect the EDBG and the on-board power supply from the ATtiny3217, do the following:
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2020 Microchip Technology Inc.
ATtiny3217 Xplained Pro
User Guide
Hardware User Guide
DS50002765B-page 21