attiny25v ATMEL Corporation, attiny25v Datasheet - Page 152
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attiny25v
Manufacturer Part Number
attiny25v
Description
Microcontroller With 2/4/8k Bytes In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATTINY25V.pdf
(231 pages)
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20.2
152
Fuse Bytes
ATtiny25/45/85
ATtiny25/45/85 has three fuse bytes, as described in
Note that fuses are read as logical zero, “0”, when programmed.
Table 20-3.
Notes:
Table 20-4.
Notes:
SELFPRGEN
RSTDISBL
DWEN
SPIEN
WDTON
EESAVE
BODLEVEL2
BODLEVEL1
BODLEVEL0
Fuse High Byte
Fuse High Byte
(1) (2) (3)
(4)
1. Enables SPM instruction. See
1. Controls use of RESET pin. See
2. After this fuse has been programmed device can be programmed via high-voltage serial mode,
3. Must be unprogrammed when lock bit security is required.
4. This fuse is not accessible in SPI programming mode.
5. See
6. See table
(5)
only.
Lock Bits” on page 151.
(1) (2)
(6)
(6)
(6)
(1)
Fuse Extended Byte
Fuse High Byte
“WDTCR – Watchdog Timer Control Register” on page 47
“BODLEVEL Fuse Coding” on page
Bit No
Bit No
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Description
-
-
-
-
-
-
-
Self-programming enabled
Description
External reset disabled
DebugWIRE enabled
Serial program and data download
enabled
Watchdog timer always on
EEPROM preserves chip erase
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
“Self-Programming the Flash” on page
“Alternate Functions of Port B” on page
171.
Table
20-3,
See “Program And Data Memory
Table
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
Default Value
0 (programmed)
(SPI prog. enabled)
1 (unprogrammed)
(EEPROM not preserved)
for details.
20-4, and
145.
61.
2586K–AVR–01/08
Table
20-5.
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