The tinyAVR OCD for new devices is based on the UPDI physical interface, which is a single pin
programming and debugging interface. It supports the following features:
- Memory-mapped access to device address space (NVM, RAM, I/O)
- No limitation on the device clock frequency
- Unlimited number of user program breakpoints
- Two hardware breakpoints
- Support for advanced OCD features
- Nonintrusive run-time chip monitoring without accessing the system registers
- Interface for reading the result of the CRC check of the Flash on a locked
device
The tinyAVR OCD for older devices is based on debugWIRE. For more on OCD features, see
debugWIRE OCD Features.