ATmega328P datasheet(294/448 Pages) ATMEL

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294

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

27. Memory Programming

27.1

Program And Data Memory Lock Bits

The ATmega88PA/168PA/328P provides six Lock bits which can be left unprogrammed (“1”) or

can be programmed (“0”) to obtain the additional features listed in Table 27-2. The Lock bits can

only be erased to “1” with the Chip Erase command. The ATmega48PA has no separate Boot

Loader section. The SPM instruction is enabled for the whole Flash if the SELFPRGEN fuse is

programmed (“0”), otherwise it is disabled.

Notes:

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

2. Only on ATmega88PA/168PA/328P.

Notes:

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

2. “1” means unprogrammed, “0” means programmed

Table 27-1.

Lock Bit Byte

(1)

Lock Bit Byte

Bit No

Description

Default Value

–

1 (unprogrammed)

–

1 (unprogrammed)

BLB12(2)

Boot Lock bit

1 (unprogrammed)

BLB11(2)

Boot Lock bit

1 (unprogrammed)

BLB02(2)

Boot Lock bit

1 (unprogrammed)

BLB01(2)

Boot Lock bit

1 (unprogrammed)

LB2

Lock bit

1 (unprogrammed)

LB1

Lock bit

1 (unprogrammed)

Table 27-2.

Lock Bit Protection Modes

(1)(2)

Memory Lock Bits

Protection Type

LB Mode

LB2

LB1

No memory lock features enabled.

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.(1)

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.(1)

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