4.5.1.1 UPDI OCD Features

The UPDI OCD for newer tinyAVR, newer megaAVR, and AVR E/D devices is based on the UPDI physical interface, which is a single pin programming and debugging interface.

Other tinyAVR and megaAVR features include:

• 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
• Non-intrusive 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

Other AVR E/D features include:

• Two hardware breakpoints
• Change of flow, interrupt, and software breakpoints
• Run-time read-out of Stack Pointer (SP) register, Program Counter (PC), and Status Register (SREG)
• Register file read- and writable in Stopped mode

For devices where the UPDI pin is shared, it can be re-configured into a GPIO or /RESET pin. For details, see UPDI High-Voltage Activation Information.

For older devices the debugWIRE OCD is available. For more on OCD features, see debugWIRE OCD Features.