
189
8008H–AVR–04/11
ATtiny48/88
20.2
Fuse Bits
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:
Notes:
2. 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
3. The SPIEN Fuse is not accessible in serial programming mode.
Table 20-3.
Fuse Extended Byte
Fuse Extended Byte
Bit No
Description
Default Value
–7
–
1
–6
–
1
–5
–
1
–4
–
1
–3
–
1
–2
–
1
–1
–
1
0
Self Programming Enable
1 (unprogrammed)
Table 20-4.
Fuse High Byte
Fuse High Byte
Bit No
Description
Default Value
7
External Reset Disable
1 (unprogrammed)
6
debugWIRE Enable
1 (unprogrammed)
5
Enable Serial Program and Data
Downloading
0 (programmed)
(SPI programming enabled)
4
Watchdog Timer Always On
1 (unprogrammed)
EESAVE
3
EEPROM memory preserved
through chip erase
1 (unprogrammed)
(EEPROM not preserved)
2
Brown-out Detector trigger level
1 (unprogrammed)
1
Brown-out Detector trigger level
1 (unprogrammed)
0
Brown-out Detector trigger level
1 (unprogrammed)