ATmega48PA/88PA/168PA/328P
Table 27-7. Fuse High Byte for ATmega48PA/88PA/168PA (Continued)
High Fuse Byte
Bit No
Description
Default Value
WDTON(3)
4
Watchdog Timer Always On
1 (unprogrammed)
EEPROM memory is
preserved through the Chip
Erase
1 (unprogrammed), EEPROM
not reserved
EESAVE
3
Brown-out Detector trigger
level
BODLEVEL2(4)
BODLEVEL1(4)
BODLEVEL0(4)
2
1
0
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
Brown-out Detector trigger
level
Brown-out Detector trigger
level
Notes: 1. See ”Alternate Functions of Port C” on page 85 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 54 for details.
4. See Table 28-4 on page 318 for BODLEVEL Fuse decoding.
Table 27-8. Fuse High Byte for ATmega328P
High Fuse Byte
RSTDISBL(1)
DWEN
Bit No
Description
Default Value
7
6
External Reset Disable
debugWIRE Enable
1 (unprogrammed)
1 (unprogrammed)
Enable Serial Program and
Data Downloading
0 (programmed, SPI
programming enabled)
SPIEN(2)
5
4
WDTON(3)
Watchdog Timer Always On
1 (unprogrammed)
EEPROM memory is
preserved through the Chip
Erase
1 (unprogrammed), EEPROM
not reserved
EESAVE
3
Select Boot Size
(see
Table 26-7 on page 289,
Table 26-10 on page 290 and
BOOTSZ1
2
0 (programmed)(4)
Table 26-13 on page 291
for details)
Select Boot Size
(see
Table 26-7 on page 289,
Table 26-10 on page 290 and
BOOTSZ0
BOOTRST
1
0
0 (programmed)(4)
1 (unprogrammed)
Table 26-13 on page 291
for details)
Select Reset Vector
Notes: 1. See ”Alternate Functions of Port C” on page 85 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 54 for details.
4. The default value of BOOTSZ[1:0] results in maximum Boot Size. See ”Pin Name Mapping” on
page 300.
297
8161D–AVR–10/09
ATMEL [ ATMEL ]
