4.5.1.2 tinyAVR OCD Features

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 4.5.1.5 debugWIRE OCD Features.