The AVR CPU includes native OCD support. It includes some powerful debug capabilities to enable profiling and detailed information about the CPU state. It is possible to alter the CPU state and resume code execution. In addition, normal debug capabilities like hardware Program Counter breakpoints, breakpoints on change of flow instructions, breakpoints on interrupts, and software breakpoints (BREAK instruction) are present. Refer to the Unified Program and Debug Interface (UPDI) chapter for details about OCD.