ATMEGA325-16AJ ATMEL [ATMEL Corporation], ATMEGA325-16AJ Datasheet - Page 257

• Manufacturer Part Number: ATMEGA325-16AJ
• Description: 8-bit Microcontroller with In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Fuse Bits
2570A–AVR–09/04
Table 108. Lock Bit Protection Modes
Notes:
The ATmega325/3250/645/6450 has three Fuse bytes. Table 109 - Table 111 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 109. Extended Fuse Byte
Notes:
BLB1 Mode
Extended Fuse Byte
–
–
–
–
–
BODLEVEL1
BODLEVEL0
RSTDISBL
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 17 on page 41 for BODLEVEL Fuse decoding.
2. Port G, PG5 is input only. Pull-up is always on.
(2)
(1)
(1)
BLB12
1
1
0
0
Bit No
7
6
5
4
5
2
1
0
BLB11
1
0
0
1
Description
–
–
–
–
–
Brown-out Detector trigger level
Brown-out Detector trigger level
External Reset Disable
Protection Type
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.
ATmega325/3250/645/6450
(1)(2)
(Continued)
Default Value
1
1
1
1
1
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
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