USERROW - User Row

The ATtiny1624/1626/1627 has one extra page of EEPROM memory that can be used for firmware settings, the User Row (USERROW). This memory supports single-byte read and write as the normal EEPROM. The CPU can write and read this memory as normal EEPROM, and the UPDI can write and read it as a normal EEPROM memory if the part is unlocked. The User Row can be written by the UPDI when the part is locked. USERROW is not affected by a chip erase.