Datasheet

226
7728G–AVR–06/10
ATtiny87/ATtiny167
Note that the fuses are read as logical zero, “0”, if they are programmed.
Notes: 1. See ”Alternate Functions of Port B” on page 81. for description of RSTDISBL Fuse.
2. The SPIEN Fuse is not accessible in serial programming mode.
3. See ”Watchdog Timer Control Register - WDTCR” on page 57. for details.
4. See Table 22-5 on page 247 for BODLEVEL Fuse coding.
Table 21-3. Extended Fuse Byte
Fuse Extended Byte Bit No Description Default Value
– 7 – 1 (unprogrammed)
– 6 – 1 (unprogrammed)
– 5 – 1 (unprogrammed)
– 4 – 1 (unprogrammed)
– 3 – 1 (unprogrammed)
– 2 – 1 (unprogrammed)
– 1 – 1 (unprogrammed)
SELFPRGEN 0 Self Programming Enable 1 (unprogrammed)
Table 21-4. Fuse High Byte
Fuse High 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 preserved)
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)