ATmega328P datasheet(295/448 Pages) ATMEL

295 / 448 page

295

8161D–AVR–10/09

ATmega48PA/88PA/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

27.2

Fuse Bits

The ATmega48PA/88PA/168PA/328P has three Fuse bytes. Table 27-5 - Table 27-9 describe

briefly the functionality of all the fuses and how they are mapped into the Fuse bytes. Note that

the fuses are read as logical zero, “0”, if they are programmed.

Table 27-3.

Lock Bit Protection Modes(1)(2). Only ATmega88PA/168PA/328P.

BLB0 Mode

BLB02

BLB01

No restrictions for SPM or LPM accessing the Application

section.

SPM is not allowed to write to the Application section.

SPM is not allowed to write to the Application section, and LPM

executing from the Boot Loader section is not allowed to read

from the Application section. If Interrupt Vectors are placed in

the Boot Loader section, interrupts are disabled while executing

from the Application section.

LPM executing from the Boot Loader section is not allowed to

read from the Application section. If Interrupt Vectors are placed

in the Boot Loader section, interrupts are disabled while

executing from the Application section.

BLB1 Mode

BLB12

BLB11

No restrictions for SPM or LPM accessing the Boot Loader

section.

SPM is not allowed to write to the Boot Loader section.

SPM is not allowed to write to the Boot Loader section, and LPM

executing from the Application section is not allowed to read

from the Boot Loader section. If Interrupt Vectors are placed in

the Application section, interrupts are disabled while executing

from the Boot Loader section.

LPM executing from the Application section is not allowed to

read from the Boot Loader section. If Interrupt Vectors are

placed in the Application section, interrupts are disabled while

executing from the Boot Loader section.

Table 27-4.

Extended Fuse Byte for ATmega48PA

Extended Fuse Byte

Bit No

Description

Default Value

–7

–

–6

–

–5

–

–4

–

–3

–

–2

–

–1

–

SELFPRGEN

Self Programming Enable

1 (unprogrammed)

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