ATTIny13-12PI ATMEL Corporation, ATTIny13-12PI Datasheet - Page 101

• Manufacturer Part Number: ATTIny13-12PI
• Description: 8-bit AVR Microcontroller with 1K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

Fuse Bytes
2535B–AVR–01/04
The ATtiny13 has two Fuse bytes. Table 44 and Table 45 describe briefly the functional-
ity 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 44. Fuse High Byte
Notes:
Table 45. Fuse Low Byte
Notes:
The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are
locked if Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the
Lock bits.
–
–
–
SELFPRGEN
DWEN
BODLEVEL1
BODLEVEL0
RSTDISBL
Fuse Low Byte
SPIEN
EESAVE
WDTON
CKDIV8
SUT1
SUT0
CKSEL1
CKSEL0
Fuse High Byte
(1)
(3)
1. See Table 13 on page 32 for BODLEVEL Fuse decoding.
2. See “Alternate Functions of Port B” on page 49 for description of RSTDISBL and
3. DWEN must be unprogrammed when Lock Bit security is required. See “Program
4. When programming the RSTDISBL Fuse, High-voltage Serial programming has to be
1. The SPIEN Fuse is not accessible in SPI Programming mode.
2. See “Watchdog Timer Control Register - WDTCR” on page 37 for details.
3. The default value of SUT1..0 results in maximum start-up time for the default clock
4. The default setting of CKSEL1..0 results in internal RC Oscillator @ 9.6 MHz. See
5. See “System Clock Prescaler” on page 24 for details.
(5)
(2)
(4)
DWEN Fuses.
And Data Memory Lock Bits” on page 100.
used to change fuses to perform further programming.
source. See Table 5 on page 22 for details.
Table 4 on page 22 for details.
(1)
(1)
7
6
5
4
3
2
1
0
Bit No
Bit No
7
6
5
4
3
2
1
0
Description
–
–
–
Self Programming Enable
debugWire Enable
Brown-out Detector trigger level
Brown-out Detector trigger level
External Reset disable
Description
Enable Serial Program
and Data Downloading
EEPROM memory is
preserved through the
Chip Erase
Watchdog Timer always
on
Divide clock by 8
Select start-up time
Select start-up time
Select Clock source
Select Clock source
Default Value
0 (programmed, SPI prog.
enabled)
1 (unprogrammed,
EEPROM not preserved)
1 (unprogrammed)
0 (programmed)
1 (unprogrammed)
0 (programmed)
1 (unprogrammed)
0 (programmed)
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
ATtiny13
(3)
(4)
(3)
(4)
101