ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 343

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Fuse Bits
2549K–AVR–01/07
Table 150. Lock Bit Protection Modes
Notes:
The ATmega640/1280/1281/2560/2561 has three Fuse bytes. Table 151 - Table 153
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 151. Extended Fuse Byte
Note:
BLB1 Mode
–
–
–
–
–
BODLEVEL2
BODLEVEL1
BODLEVEL0
Fuse Low Byte
1
2
3
4
Memory Lock Bits
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
1. See Table 27 on page 60 for BODLEVEL Fuse decoding.
(1)
(1)
(1)
BLB12
1
1
0
0
7
6
5
4
3
2
1
0
Bit No
ATmega640/1280/1281/2560/2561
BLB11
1
0
0
1
Description
–
–
–
–
–
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
Protection Type
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.
(1)(2)
(Continued)
1
1
1
1
1
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
343