Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI Data Sheet

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ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]

Atmel-8271H-AVR- ATmega-Datasheet_08/2014

The ATmega 48A/48PA provides two Lock bits and the ATmega88A/88PA/168A/168PA/328/328Pprovides six 
Lock bits. These can be left unprogrammed (“1”) or can be programmed (“0”) to obtain the additional features 
listed in 

. The Lock bits can only be erased to “1” with the Chip Erase command. 

The ATmega 48A/48PA has no separate Boot Loader section, and the SPM instruction is enabled for the whole 
Flash if the SELFPRGEN fuse is programmed (“0”). Otherwise the SPM instruction is disabled.

Notes: 1.

“1” means unprogrammed, “0” means programmed.

2.

Only on ATmega88A/88PA/168A/168PA/328/328P. 

Notes: 1.

Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.

2.

“1” means unprogrammed, “0” means programmed

Lock Bit Byte

7

–

1 (unprogrammed)

6

–

1 (unprogrammed)

5

Boot Lock bit

1 (unprogrammed)

BLB11

4

Boot Lock bit

1 (unprogrammed)

3

Boot Lock bit

1 (unprogrammed)

2

Boot Lock bit

1 (unprogrammed)

LB2

1

Lock bit

1 (unprogrammed)

LB1

0

Lock bit

1 (unprogrammed)

Lock Bit Protection Modes

 

1

1

1

No memory lock features enabled.

2

1

0

Further programming of the Flash and EEPROM is disabled in 
Parallel and Serial Programming mode. The Fuse bits are 
locked in both Serial and Parallel Programming mode.

3

0

0

Further programming and verification of the Flash and EEPROM 
is disabled in Parallel and Serial Programming mode. The Boot 
Lock bits and Fuse bits are locked in both Serial and Parallel 
Programming mode.