ATmega169P datasheet(296/393 Pages) ATMEL

296 / 393 page

296

8018N–AVR–08/09

ATmega169P

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 ATmega169P has three Fuse bytes. Table 27-3 - Table 27-5 describe briefly the functional-

ity 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 28-5 on page 332 for BODLEVEL Fuse decoding.

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

85.

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 27-2.

Lock Bit Protection Modes

(1)(2) (Continued)

Memory Lock Bits

Protection Type

Table 27-3.

Extended Fuse Byte

Fuse Low Byte

Bit No

Description

Default Value

–7

–

–6

–

–5

–

–4

–

BODLEVEL2(1)

Brown-out Detector trigger level

1 (unprogrammed)

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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