ATmega3290P datasheet(294/385 Pages) ATMEL

294 / 385 page

294

8021E–AVR–07/09

ATmega329P/3290P

Notes:

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

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

26.2

Fuse Bits

The ATmega329P/3290P has three Fuse bytes. Table 26-3 - Table 26-5 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.

Notes:

1. See Table 27-5 on page 331 for BODLEVEL Fuse decoding.

2. Port G, PG5 is input only. Pull-up is always on. See ”Alternate Functions of Port G” on page 81

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 26-2.

Lock Bit Protection Modes

(1)(2) (Continued)

Memory Lock Bits

Protection Type

Table 26-3.

Extended Fuse Byte

Bit No

Description

Default Value

–7

–

–6

–

–5

–

–4

–

–5

–

BODLEVEL1(1)

Brown-out Detector trigger level

1 (unprogrammed)

BODLEVEL0(1)

Brown-out Detector trigger level

1 (unprogrammed)

RSTDISBL(2)

External Reset Disable

1 (unprogrammed)

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