Fuse bits – Rainbow Electronics ATmega3290P_V User Manual
Page 282
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ATmega329/3290/649/6490
2552H–AVR–11/06
Notes:
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
Fuse Bits
The ATmega329/3290/649/6490 has three Fuse bytes. Table 125 - Table 127 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.
Notes:
1. See Table 17 on page 43 for BODLEVEL Fuse decoding.
2. Port G, PG5 is input only. Pull-up is always on. See “Alternate Functions of Port G” on
BLB1 Mode
BLB12
BLB11
1
1
1
No restrictions for SPM or LPM accessing the Boot Loader
section.
2
1
0
SPM is not allowed to write to the Boot Loader section.
3
0
0
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.
4
0
1
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 124. Lock Bit Protection Modes
(1)(2)
(Continued)
Memory Lock Bits
Protection Type
Table 125. Extended Fuse Byte
Extended Fuse Byte
Bit No
Description
Default Value
–
7
–
1
–
6
–
1
–
5
–
1
–
4
–
1
–
5
–
1
BODLEVEL1
(1)
2
Brown-out Detector trigger level
1 (unprogrammed)
BODLEVEL0
(1)
1
Brown-out Detector trigger level
1 (unprogrammed)
RSTDISBL
0
External Reset Disable
1 (unprogrammed)