Rainbow-electronics ATmega3290P_V Manual de usuario descargar pdf (Pagina 282)

282

ATmega329/3290/649/6490

2552H–AVR–11/06

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 ATmega329/3290/649/6490 has three Fuse bytes. Table 125 - Table 127 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 17 on page 43 for BODLEVEL Fuse decoding.

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

page 79.

BLB1 Mode BLB12 BLB11

111

No restrictions for SPM or LPM accessing the Boot Loader

section.

2 1 0 SPM is not allowed to write to the Boot Loader section.

300

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.

401

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 124. Lock Bit Protection Modes

(1)(2)

(Continued)

Memory Lock Bits Protection Type

Table 125. Extended Fuse Byte

Extended Fuse Byte Bit No Description Default Value

–7– 1

–6– 1

–5– 1

–4– 1

–5– 1

BODLEVEL1

(1)

2 Brown-out Detector trigger level 1 (unprogrammed)

BODLEVEL0

(1)

1 Brown-out Detector trigger level 1 (unprogrammed)

RSTDISBL

(2)

0 External Reset Disable 1 (unprogrammed)

1 2 ... 277 278 279 280 281 282 283 284 285 286 287 ... 374 375

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