Rainbow-electronics ATmega128L Manual do Utilizador descarregar pdf (Página 280)

280

ATmega128(L)

2467B–09/01

Notes: 1. Program the fuse bits before programming the Lock bits.

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

Fuse Bits The ATmega128 has three fuse bytes. Table 118 - Table 120 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 “ATmega103 and ATmega128 Compatibility” on page 4 for details.

2. See “Watchdog Timer Control Register – WDTCR” on page 51 for details.

BLB1 mode BLB12 BLB11

111

No restrictions for SPM or (E)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 (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.

401

(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 117. Lock Bit Protection Modes (Continued)

Memory Lock Bits Protection Type

Table 118. Extended Fuse Byte

Extended Fuse Byte Bit No. Description Default Value

– 7 – 1

– 6 – 1

– 5 – 1

– 4 – 1

– 3 – 1

– 2 – 1

M103C

(1)

1 ATmega103 compatibility mode 0 (programmed)

WDTON

(2)

0 Watchdog timer always on 1 (unprogrammed)

1 2 ... 275 276 277 278 279 280 281 282 283 284 285 ... 330 331

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