ATMEGA8_08 Datasheet, PDF(224/308 Page) ATMEL Corporation – 8-bit with 8K Bytes In-System Programmable Flash

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ATMEGA8_08 Datasheet, PDF (224/308 Pages) ATMEL Corporation – 8-bit with 8K Bytes In-System Programmable Flash

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Latching of Fuses

Table 88. Fuse Low Byte

Fuse Low

Byte

Bit

No. Description

Default Value

BODLEVEL

7

Brown out detector trigger level 1 (unprogrammed)

BODEN

6 Brown out detector enable

1 (unprogrammed, BOD disabled)

SUT1

5 Select start-up time

1 (unprogrammed)(1)

SUT0

4 Select start-up time

0 (programmed)(1)

CKSEL3

3 Select Clock source

0 (programmed)(2)

CKSEL2

2 Select Clock source

0 (programmed)(2)

CKSEL1

1 Select Clock source

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. SeeTable 10 on page 30 for

details.

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

page 26 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.

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

the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on

Power-up in Normal mode.

224 ATmega8(L)

2486TâAVRâ05/08

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