attiny13-20ss ATMEL Corporation, attiny13-20ss Datasheet - Page 104

• Manufacturer Part Number: attiny13-20ss
• Description: 8-bit Microcontroller With 1k Bytes In-system Programmable Flash - Atmel Corporation
• Manufacturer: ATMEL Corporation

Fuse Bytes
104
ATtiny13
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:
–
–
–
SELFPRGEN
DWEN
BODLEVEL1
BODLEVEL0
RSTDISBL
Fuse Low Byte
SPIEN
EESAVE
WDTON
CKDIV8
SUT1
SUT0
CKSEL1
CKSEL0
Fuse High Byte
(3)
(1)
1. See Table 13 on page 33 for BODLEVEL Fuse decoding.
2. See “Alternate Functions of Port B” on page 51 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 39 for details. Program-
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 25 for details.
(5)
(2)
(4)
DWEN Fuses.
And Data Memory Lock Bits” on page 103.
used to change fuses to perform further programming.
ming this fues will disable the Watchdog Timer Interrupt.
source. See Table 5 on page 23 for details.
Table 4 on page 23 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)
2535G–AVR–01/07
(3)
(4)
(3)
(4)