Datasheet

Table 32-7. Fuse Low Byte

Low Fuse Byte Bit No. Description Default Value

CKDIV8

(4)

7 Divide clock by 8 0 (programmed)

CKOUT

(3)

6 Clock output 1 (unprogrammed)

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 1 (unprogrammed)

(2)

CKSEL0 0 Select Clock source 0 (programmed)

(2)

Note:

1. The default value of SUT[1:0] results in maximum start-up time for the default clock source. See

table Start-Up Times for the Internal Calibrated RC Oscillator Clock Selection - SUT in Calibrated

Internal RC Oscillator of System Clock and Clock Options chapter for details.

2. The default setting of CKSEL[3:0] results in internal RC Oscillator @ 8 MHz. See table Internal

Calibrated RC Oscillator Operating Modes in Calibrated Internal RC Oscillator of the System Clock

and Clock Options chapter for details.

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

section in the System Clock and Clock Options chapter for details.

4. Refer to System Clock Prescaler section in the System Clock and Clock Options chapter 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.