ATmega128 datasheet(287/386 Pages) ATMEL

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2467S–AVR–07/09

ATmega128

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 117 - Table 119 describe briefly the functionality of

all the fuses and how they are mapped into the fuse bytes. Note that the fuses are read as logi-

cal 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 56 for details.

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 116. Lock Bit Protection Modes (Continued)

Memory Lock Bits

Protection Type

Table 117. Extended Fuse Byte

Extended Fuse Byte

Bit No.

Description

Default Value

–7

–

–6

–

–5

–

–4

–

–3

–

–2

–

M103C(1)

ATmega103 compatibility mode

0 (programmed)

WDTON(2)

Watchdog Timer always on

1 (unprogrammed)

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