Datasheet

253
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
Table 28-5. Extended Fuse Byte for Atmel ATmega88PA/168PA
Extended Fuse Byte Bit No Description Default Value
– 7 – 1
– 6 – 1
– 5 – 1
– 4 – 1
– 3 – 1
BOOTSZ1 2
Select boot size (see
Table 27-7 on page 247 and Table
27-10 on page 248 for details)
0 (programmed)
(1)
BOOTSZ0 1
Select boot size (see
Table 27-7 on page 247 and Table
27-10 on page 248 for details)
0 (programmed)
(1)
BOOTRST 0 Select reset vector 1 (unprogrammed)
Note: 1. The default value of BOOTSZ[1:0] results in maximum boot size. See Section 28-11 “Pin Name Mapping” on
page 256.
Table 28-6. Fuse High Byte for the Atmel ATmega48PA/88PA/168PA
High Fuse Byte Bit No Description Default Value
RSTDISBL
(1)
7 External reset disable 1 (unprogrammed)
DWEN 6 debugWIRE enable 1 (unprogrammed)
SPIEN
(2)
5
Enable serial program and data
downloading
0 (programmed, SPI programming
enabled)
WDTON
(3)
4 Watchdog timer always on 1 (unprogrammed)
EESAVE 3
EEPROM memory is preserved
through the chip erase
1 (unprogrammed), EEPROM not
reserved
BODLEVEL2
(4)
2 Brown-out detector trigger level 1 (unprogrammed)
BODLEVEL1
(4)
1 Brown-out detector trigger level 0 (programmed)
BODLEVEL0
(4)
0 Brown-out detector trigger level 1 (unprogrammed)
Notes: 1. See Section 14.3.2 “Alternate Functions of Port C” on page 74 for description of RSTDISBL fuse.
2. The SPIEN fuse is not accessible in serial programming mode.
3. See Section 11.9.2 “WDTCSR – Watchdog Timer Control Register” on page 48 for details.
4. See Table 29-6 on page 272 for BODLEVEL fuse decoding (default = 2.7V).