DOC7707 datasheet(244/307 Pages) ETC1

244 / 307 page

244

7707F–AVR–11/10

AT90USB82/162

Notes:

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

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

25.2

Fuse Bits

The AT90USB82/162 has four Fuse bytes. Table 25-3 - Table 25-5 describe briefly the function-

ality 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.

Note:

1. See Table 9-2 on page 49 for BODLEVEL Fuse decoding.

BLB1 Mode

BLB12

BLB11

No restrictions for SPM or (E)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

(E)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.

(E)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 25-2.

Lock Bit Protection Modes

(1)(2) (Continued)

Memory Lock Bits

Protection Type

Table 25-3.

Extended Fuse Byte

Fuse Low Byte

Bit No

Description

Default Value : 0xF4

–7

–

–6

–

–5

–

–4

–

HWBE

Hardware Boot Enable

0 (programmed)

BODLEVEL2(1)

Brown-out Detector trigger level

1 (unprogrammed)

BODLEVEL1(1)

Brown-out Detector trigger level

0 (programmed)

BODLEVEL0(1)

Brown-out Detector trigger level

0 (programmed)

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