ATmega162 datasheet(232/324 Pages) ATMEL

232 / 324 page

232

2513K–AVR–07/09

ATmega162/V

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 ATmega162 has three Fuse bytes. Table 99 and Table 100 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 “ATmega161 Compatibility Mode” on page 4 for details.

2. See Table 19 on page 50 for BODLEVEL Fuse decoding.

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 97. Lock Bit Protection Modes

(1)(2) (Continued)

Memory Lock Bits

Protection Type

Table 98. Extended Fuse Byte

(1)(2)

Fuse Low Byte

Bit no

Description

Default Value

–7

–

–6

–

–5

–

M161C

ATmega161 compatibility

mode

1 (unprogrammed)

BODLEVEL2(2)

Brown-out Detector

trigger level

1 (unprogrammed)

BODLEVEL1(2)

Brown-out Detector

trigger level

1 (unprogrammed)

BODLEVEL0(2)

Brown-out Detector

trigger level

1 (unprogrammed)

–0

–

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