ATmega165 datasheet(247/336 Pages) ATMEL

247 / 336 page

247

ATmega165/V

2573G–AVR–07/09

Notes:

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

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

Fuse Bits

The ATmega165 has three Fuse bytes. Table 101 - Table 103 describe briefly the func-

tionality 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 17 on page 40 for BODLEVEL Fuse decoding.

2. This bit should never be programmed.

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 100. Lock Bit Protection Modes

(1)(2) (Continued)

Memory Lock Bits

Protection Type

Table 101. 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)

RESERVED(2)

1 (unprogrammed)

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