Signature Row (Sigrow) - Microchip Technology megaAVR 0 Series Manual

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 also be written by the UPDI when the part is locked. USERROW is not affected by a chip erase. The
USERROW can be used for final configuration without having programming or debugging capabilities
enabled.
5.7

Signature Row (SIGROW)

The content of the Signature Row fuses (SIGROW) is pre-programmed and cannot be altered. SIGROW
holds information such as device ID, serial number, and calibration values.
All AVR microcontrollers have a three-byte device ID which identifies the device. This device ID can be
read in both serial and parallel mode, also when the device is locked. The three bytes reside in the
Signature Row. The signature bytes are given in the following table.
Table 5-4. Device ID
Device Name
ATmega4809
ATmega4808
ATmega3209
ATmega3208
©
2018 Microchip Technology Inc.
Signature Bytes Address
0x00 0x01
0x1E 0x96
0x1E 0x96
0x1E 0x95
0x1E 0x95
Datasheet Preliminary
®
megaAVR 0-Series
Memories
0x02
0x51
0x50
0x31
0x30
DS40002015A-page 20