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
Table 1. Programming and Debugging
Interfaces Summary
|
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 |