4.2.2 tinyAVR®, megaAVR®, and XMEGA® Devices
The AVR devices feature various programming and debugging interfaces. Check the device data sheet for supported interfaces of that device.
- Some tinyAVR® devices have a TPI interface. TPI can be used for programming the device only. These devices do not have on-chip debug capability at all.
- Some tinyAVR devices and some megaAVR devices have the debugWIRE interface, which connects to an on-chip debug system known as tinyOCD. All devices with debugWIRE also have the SPI interface for in-system programming.
- Some megaAVR devices have a JTAG interface for programming and debugging, with an on-chip debug system, also known as megaOCD. All devices with JTAG also feature the SPI interface as an alternative interface for in-system programming.
- All AVR XMEGA devices have the PDI interface for programming and debugging. Some AVR XMEGA devices also have a JTAG interface with identical functionality.
- New tinyAVR devices have a UPDI interface, which is used for programming and debugging.
| UPDI | TPI | SPI | debugWIRE | JTAG | PDI | |
|---|---|---|---|---|---|---|
| tinyAVR | New devices | Some devices | Some devices | Some devices | ||
| megaAVR | All devices | Some devices | Some devices | |||
| AVR XMEGA | Some devices | All devices |