Datasheet

293
8025M–AVR–6/11
ATmega48P/88P/168P
Note: 1. The default value of BOOTSZ[1:0] results in maximum Boot Size. See ”Pin Name Mapping” on
page 296.
Notes: 1. See ”Alternate Functions of Port C” on page 83 for description of RSTDISBL Fuse.
2. The SPIEN Fuse is not accessible in serial programming mode.
3. See ”WDTCSR – Watchdog Timer Control Register” on page 55 for details.
4. See Table 29-4 on page 314 for BODLEVEL Fuse decoding.
Table 28-5. Extended Fuse Byte for ATmega88P/168P
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 287 and
Table 27-10 on page 288
for details)
0 (programmed)
(1)
BOOTSZ0 1
Select Boot Size
(see
Table 27-7 on page 287 and
Table 27-10 on page 288
for details)
0 (programmed)
(1)
BOOTRST 0 Select Reset Vector 1 (unprogrammed)
Table 28-6. Fuse High Byte for ATmega48P/88P/168P
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
1 (unprogrammed)
BODLEVEL0
(4)
0
Brown-out Detector trigger
level
1 (unprogrammed)