ATmega128 datasheet(288/386 Pages) ATMEL

288 / 386 page

288

2467S–AVR–07/09

ATmega128

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 37 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.

Notes:

1. The default value of SUT1..0 results in maximum start-up time. See Table 14 on page 42 for

details.

2. The default setting of CKSEL3..0 results in Internal RC Oscillator @ 1 MHz. See Table 6 on

page 37 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

Table 118. Fuse High Byte

Fuse High

Byte

Bit No.

Description

Default Value

OCDEN(4)

Enable OCD

1 (unprogrammed, OCD

disabled)

JTAGEN(5)

Enable JTAG

0 (programmed, JTAG enabled)

SPIEN(1)

Enable

Serial Program and

Data Downloading

0 (programmed, SPI prog.

enabled)

CKOPT(2)

Oscillator options

1 (unprogrammed)

EESAVE

EEPROM memory is preserved

through the Chip Erase

1 (unprogrammed, EEPROM not

preserved)

BOOTSZ1

Select Boot Size (see

Table 112

for details)

0 (programmed)(3)

BOOTSZ0

Select Boot Size (see

Table 112

for details)

0 (programmed)(3)

BOOTRST

Select Reset Vector

1 (unprogrammed)

Table 119. Fuse Low Byte

Fuse Low

Byte

Bit No.

Description

Default Value

BODLEVEL

Brown out detector trigger level

1 (unprogrammed)

BODEN

Brown out detector enable

1 (unprogrammed, BOD disabled)

SUT1

Select start-up time

1 (unprogrammed)(1)

SUT0

Select start-up time

0 (programmed)(1)

CKSEL3

Select Clock source

0 (programmed)(2)

CKSEL2

Select Clock source

0 (programmed)(2)

CKSEL1

Select Clock source

0 (programmed)(2)

CKSEL0

Select Clock source

1 (unprogrammed)(2)

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