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ATmega128
Table 118. Fuse High Byte
Fuse High
OCDEN
Byte
(4)
Bit No.
7
Description
Enable OCD
Default Value
1 (unprogrammed, OCD
disabled)
JTAGEN (5)
6
Enable JTAG
0 (programmed, JTAG enabled)
SPIEN
(1)
5
Enable Serial Program and
0 (programmed, SPI prog.
Data Downloading
enabled)
CKOPT (2)
EESAVE
BOOTSZ1
4
3
2
Oscillator options
EEPROM memory is preserved
through the Chip Erase
Select Boot Size (see Table 112
1 (unprogrammed)
1 (unprogrammed, EEPROM not
preserved)
0 (programmed) (3)
for details)
BOOTSZ0
1
Select Boot Size (see Table 112
0 (programmed) (3)
for details)
BOOTRST
0
Select Reset Vector
1 (unprogrammed)
Notes:
1. The SPIEN fuse is not accessible in SPI Serial Programming mode.
2. The CKOPT fuse functionality depends on the setting of the CKSEL bits. See “Clock
Sources” on page 36 for details.
3. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 112 on page 284
4. Never ship a product with the OCDEN Fuse programmed regardless of the setting of lock bits
and the JTAGEN Fuse. A programmed OCDEN Fuse enables some parts of the clock system
to be running in all sleep modes. This may increase the power consumption.
5. If the JTAG interface is left unconnected, the JTAGEN fuse should if possible be disabled. This
to avoid static current at the TDO pin in the JTAG interface.
Table 119. Fuse Low Byte
Fuse Low
Byte
BODLEVEL
BODEN
SUT1
SUT0
CKSEL3
CKSEL2
CKSEL1
Bit No.
7
6
5
4
3
2
1
Description
Brown out detector trigger level
Brown out detector enable
Select start-up time
Select start-up time
Select Clock source
Select Clock source
Select Clock source
Default Value
1 (unprogrammed)
1 (unprogrammed, BOD disabled)
1 (unprogrammed) (1)
0 (programmed) (1)
0 (programmed) (2)
0 (programmed) (2)
0 (programmed) (2)
CKSEL0 0 Select Clock source 1 (unprogrammed) (2)
Notes: 1. The default value of SUT1..0 results in maximum start-up time. See Table 14 on page 41 for
details.
2. The default setting of CKSEL3..0 results in Internal RC Oscillator @ 1MHz. See Table 6 on
page 36 for details.
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.
Latching of Fuses
The Fuse values are latched when the device enters Programming mode and changes of the
fuse values will have no effect until the part leaves Programming mode. This does not apply to
288
2467X–AVR–06/11
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