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ATmega128
Table 116. Lock Bit Protection Modes (Continued)
Memory Lock Bits
Protection Type
1
2
1
1
1
0
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
3
0
0
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
4 0 1
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.
Notes: 1. Program the fuse bits before programming the Lock bits.
2. “1” means unprogrammed, “0′means programmed
Fuse Bits
The Atmel ? AVR ? 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 logical zero, “0”, if they are programmed.
Table 117. Extended Fuse Byte
M103C
W DTON
Extended Fuse Byte
–
–
–
–
–
–
(1)
(2)
Bit No.
7
6
5
4
3
2
1
0
Description
–
–
–
–
–
–
ATmega103 compatibility mode
W atchdog Timer always on
Default Value
1
1
1
1
1
1
0 (programmed)
1 (unprogrammed)
Notes:
1. See “ATmega103 and ATmega128 Compatibility” on page 4 for details.
2. See “ W atchdog Timer Control Register – W DTCR” on page 55 for details.
287
2467X–AVR–06/11
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