ATmega88 datasheet(281/340 Pages) ATMEL

281 / 340 page

281

7530H–AVR–02/09

ATmega48/88/168 Automotive

Notes:

1. See “Alternate Functions of Port C” on page 74 for description of RSTDISBL Fuse.

2. The SPIEN Fuse is not accessible in serial programming mode.

3. See “Watchdog Timer Control Register - WDTCSR” on page 50 for details.

4. See Table 8-2 on page 44 for BODLEVEL Fuse decoding.

Note:

1. The default value of SUT1..0 results in maximum start-up time for the default clock source.

See Table 6-9 on page 31 for details.

2. The default setting of CKSEL3..0 results in internal RC Oscillator @ 8 MHz. See Table 6-8 on

page 30 for details.

3. The CKOUT Fuse allows the system clock to be output on PORTB0. See “Clock Output Buffer”

on page 33 for details.

4. See “System Clock Prescaler” on page 34 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.

Table 25-6.

Fuse High Byte

High Fuse Byte

Bit No

Description

Default Value

RSTDISBL(1)

External Reset Disable

1 (unprogrammed)

DWEN

debugWIRE Enable

1 (unprogrammed)

SPIEN(2)

Enable Serial Program and

Data Downloading

0 (programmed, SPI

programming enabled)

WDTON(3)

Watchdog Timer Always On

1 (unprogrammed)

EESAVE

EEPROM memory is

preserved through the Chip

Erase

1 (unprogrammed), EEPROM

not reserved

BODLEVEL2(4)

Brown-out Detector trigger

level

1 (unprogrammed)

BODLEVEL1(4)

Brown-out Detector trigger

level

1 (unprogrammed)

BODLEVEL0(4)

Brown-out Detector trigger

level

1 (unprogrammed)

Table 25-7.

Fuse Low Byte

Low Fuse Byte

Bit No

Description

Default Value

CKDIV8(4)

Divide clock by 8

0 (programmed)

CKOUT(3)

Clock output

1 (unprogrammed)

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

1 (unprogrammed)(2)

CKSEL0

Select Clock source

0 (programmed)(2)

ATmega88 Datasheet(PDF) 281 Page - ATMEL Corporation

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