attiny24v ATMEL Corporation, attiny24v Datasheet - Page 160

• Manufacturer Part Number: attiny24v
• Description: 8-bit Avr Microcontroller With 2/4/8k Bytes Insystem Programmable Flash
• Manufacturer: ATMEL Corporation

19.2
160
Fuse Bytes
ATtiny24/44/84
The ATtiny24/44/84 have three fuse bytes.
describe the functionality 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 19-3.
Notes:
Table 19-4.
Notes:
Fuse Extended Byte
SELFPRGEN
Fuse High Byte
RSTDISBL
DWEN
SPIEN
WDTON
EESAVE
BODLEVEL2
BODLEVEL1
BODLEVEL0
(2)
(3)
1. Enables SPM instruction. See
1. See
2. DWEN must be unprogrammed when Lock Bit security is required. See
3. The SPIEN Fuse is not accessible in SPI programming mode.
4. Programming this fues will disable the Watchdog Timer Interrupt. See
5. See
(4)
Fuses. After programming the RSTDISBL fuse, high-voltage serial programming must be used
to change fuses and allow further programming.
Memory Lock Bits” on page
a Function of the Fuse Settings of WDTON” on page 43
(1)
(5)
(5)
(5)
(1)
Fuse Extended Byte
Fuse High Byte
“Alternate Functions of Port B” on page 65
Table 20-7 on page 179
Bit No
7
6
6
4
3
2
1
0
Bit No
7
6
5
4
3
2
1
0
Description
External Reset disable
DebugWIRE Enable
Enable Serial Program and Data
Downloading
Watchdog Timer always on
EEPROM memory is preserved through
the Chip Erase
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
Description
-
-
-
-
-
-
-
Self-Programming Enable
159.
for BODLEVEL Fuse decoding.
“Self-Programming the Flash” on page
Table
19-3,
for description of RSTDISBL and DWEN
Table 19-4
for details.
Default Value
1 (unprogrammed)
1 (unprogrammed)
0 (programmed, SPI prog.
enabled)
1 (unprogrammed)
1 (unprogrammed,
EEPROM not preserved)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
and
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
153.
“WDT Configuration as
“Program And Data
Table 19-5
8006H–AVR–10/09
briefly