ATMEGA48V_11 ATMEL [ATMEL Corporation], ATMEGA48V_11 Datasheet - Page 286

• Manufacturer Part Number: ATMEGA48V_11
• Description: 8-bit Atmel Microcontroller with 4/8/16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

28.2
2545T–AVR–05/11
Fuse bits
Table 28-3.
Notes:
The Atmel ATmega48/88/168 has three fuse bytes.
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 28-4.
Extended fuse byte
–
–
–
–
–
–
–
SELFPRGEN
BLB0 mode
BLB1 mode
1
2
3
4
1
2
3
4
1. Program the fuse bits and boot lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed.
Lock bit protection modes
Extended fuse byte for mega48.
BLB02
BLB12
1
1
0
0
1
1
0
0
BLB01
BLB11
Bit no.
1
0
0
1
1
0
0
1
7
6
5
4
3
2
1
0
No restrictions for SPM or LPM accessing the application
section.
SPM is not allowed to write to the application section.
SPM is not allowed to write to the application section, and LPM
executing from the boot loader section is not allowed to read
from the application section. If interrupt vectors are placed in the
boot loader section, interrupts are disabled while executing from
the application section.
LPM executing from the boot loader section is not allowed to
read from the application section. If interrupt vectors are placed
in the boot loader section, interrupts are disabled while
executing from the application section.
No restrictions for SPM or 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 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.
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.
Description
–
–
–
–
–
–
–
Self programming enable
(1)(2)
. Only Atmel ATmega88/168.
Table 28-4
ATmega48/88/168
through
Default value
1
1
1
1
1
1
1
1 (unprogrammed)
Table 28-7 on page 288
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