
159
2543L–AVR–08/10
ATtiny2313
Fuse Bits
The ATtiny2313 has three Fuse bytes.
Table 67 and
Table 68 describe briefly the functionality of
all the fuses and how they are mapped into the Fuse bytes. Note that the fuses are read as logi-
cal zero, “0”, if they are programmed.
Note:
1. The SPIEN Fuse is not accessible in serial programming mode.
3. Never ship a product with the DWEN Fuse programmed regardless of the setting of Lock bits.
A programmed DWEN Fuse enables some parts of the clock system to be running in all sleep
modes. This may increase the power consumption.
Table 66. Fuse Extended 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 67. Fuse High Byte
Fuse High Byte
Bit
No
Description
Default Value
7
debugWIRE Enable
1 (unprogrammed)
EESAVE
6
EEPROM memory is preserved
through the Chip Erase
1 (unprogrammed, EEPROM
not preserved)
5
Enable Serial Program and Data
Downloading
0 (programmed, SPI prog.
enabled)
4
Watchdog Timer always on
1 (unprogrammed)
3
Brown-out Detector trigger level
1 (unprogrammed)
2
Brown-out Detector trigger level
1 (unprogrammed)
1
Brown-out Detector trigger level
1 (unprogrammed)
0
External Reset disable
1 (unprogrammed)