ATmega328P datasheet(286/345 Pages) ATMEL

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286

7810A–AVR–11/09

ATmega328P [Preliminary]

27. Memory Programming

27.1

Program And Data Memory Lock Bits

The ATmega328P provides six Lock bits which can be left unprogrammed (“1”) or can be pro-

grammed (“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 ATmega328P has no separate Boot Loader

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

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

Notes:

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

2. Only on ATmega328P.

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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