Datasheet

294
ATmega169A/PA/329A/PA/649A/P/3290A/PA/6490A/P [DATASHEET]
8284E–AVR–02/2013
Notes: 1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed.
28.2 Fuse bits
The Atmel ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P has three Fuse bytes.
Table 28-3 toTable 28-5 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 29-15 on page 334 for BODLEVEL Fuse decoding.
2. Port G, PG5 is input only. Pull-up is always on. See ”Alternate Functions of Port G” on page 84.
2 1 0 SPM is not allowed to write to the Boot Loader section.
300
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.
401
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 28-2. Lock Bit Protection modes
(1)(2)
. (Continued)
Memory Lock bits Protection type
Table 28-3. Extended fuse byte.
Extended fuse byte Bit no. Description Default value
–7– 1
–6– 1
–5– 1
–4– 1
BODLEVEL2
(1)
2 Brown-out Detector trigger level 1 (unprogrammed)
BODLEVEL1
(1)
2 Brown-out Detector trigger level 1 (unprogrammed)
BODLEVEL0
(1)
1 Brown-out Detector trigger level 1 (unprogrammed)
RSTDISBL
(2)
0 External Reset Disable 1 (unprogrammed)