ATTINY2313 Datasheet, PDF (160/211 Pages) ATMEL Corporation – 8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash

Fuse Bits
The ATtiny2313 has three Fuse bytes. Table 68 and Table 69 describe briefly the func-
tionality 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.
Table 67. Fuse Extended Byte
Fuse Extended
Byte
Bit
No Description
7–
6–
5–
4–
3–
2–
1–
SPMEN
0 Self Programming Enable
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
Table 68. Fuse High Byte
Bit
Fuse High Byte No Description
DWEN⁽³⁾
7 debugWIRE Enable
Default Value
1 (unprogrammed)
EESAVE
6
EEPROM memory is preserved 1 (unprogrammed, EEPROM
through the Chip Erase
not preserved)
SPIEN⁽¹⁾
5
Enable Serial Program and Data 0 (programmed, SPI prog.
Downloading
enabled)
WDTON⁽²⁾
BODLEVEL2⁽⁴⁾
4 Watchdog Timer always on
1 (unprogrammed)
3 Brown-out Detector trigger level 1 (unprogrammed)
BODLEVEL1⁽⁴⁾
BODLEVEL0⁽⁴⁾
2 Brown-out Detector trigger level 1 (unprogrammed)
1 Brown-out Detector trigger level 1 (unprogrammed)
RSTDISBL⁽⁵⁾
0 External Reset disable
1 (unprogrammed)
Note:
1. The SPIEN Fuse is not accessible in serial programming mode.
2. See “Watchdog Timer Control Register – WDTCR” on page 39 for details.
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.
4. See Table 16 on page 35 for BODLEVEL Fuse decoding.
5. See “Alternate Functions of Port A” on page 53 for description of RSTDISBL Fuse.
160 ATtiny2313/V
2543C–AVR–12/03