Datasheet

179
8246B–AVR–09/11
ATtiny2313A/4313
20.2 Fuse Bits
Fuse bits are described in Table 20-3, Table 20-4, and Table 20-5. Note that programmed fuses
read as zero.
Notes: 1. Programming this fuse bit will change the functionality of the RESET pin and render further
programming via the serial interface impossible. The fuse bit can be unprogrammed using the
parallel programming algorithm (see page 184).
2. This setting does not preserve EEPROM.
3. This fuse bit is not accessible in serial programming mode.
4. This setting enables SPI programming.
Table 20-3. Extended Fuse Byte
Bit # Bit Name Use See Default Value
7 – – 1 (unprogrammed)
6 – – 1 (unprogrammed)
5 – – 1 (unprogrammed)
4 – – 1 (unprogrammed)
3 – – 1 (unprogrammed)
2 – – 1 (unprogrammed)
1 – – 1 (unprogrammed)
0 SELFPRGEN Enables SPM instruction Page 173 1 (unprogrammed)
Table 20-4. High Fuse Byte
Bit # Bit Name Use See Default Value
7 DWEN Enables debugWIRE
(1)
Page 170 1 (unprogrammed)
6 EESAVE
Preserves EEPROM memory during
Chip Erase operation
Page 187 1 (unprogrammed)
(2)
5 SPIEN
Enables serial programming and
downloading of data to device
(3)
0 (programmed)
(4)
4 WDTON Sets watchdog timer permanently on Page 45 1 (unprogrammed)
3 BODLEVEL2
Sets BOD trigger level Page 202
1 (unprogrammed)
2 BODLEVEL1 1 (unprogrammed)
1 BODLEVEL0 1 (unprogrammed)
0 RSTDISBL Disables external reset
(1)
Page 41 1 (unprogrammed)