m328 clock fuse settings

szczys
4 months ago
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Note: 1. The default value of SUT1...0 results in maximum start-up time for the default clock source.
See Table 9-12 on page 34 for details.
2. The default setting of CKSEL3...0 results in internal RC Oscillator @ 8MHz. See Table 9-11 on
page 34 for details.
3. The CKOUT Fuse allows the system clock to be output on PORTB0. See ”Clock Output Buffer”
on page 36 for details.
4. See ”System Clock Prescaler” 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.
Table 28-9. Fuse Low Byte
Low Fuse Byte
Bit No
CKDIV8(4)
7
CKOUT(3)
6
SUT1
5
SUT0
4
CKSEL3
3
CKSEL2
2
CKSEL1
1
CKSEL0
0
Description
Divide clock by 8
Clock output
Select start-up time
Select start-up time
Select Clock source
Select Clock source
Select Clock source
Select Clock source
Default Value
0 (programmed)
1 (unprogrammed)
1 (unprogrammed)(1)
0 (programmed)(1)
0 (programmed)(2)
0 (programmed)(2)
1 (unprogrammed)(2)
0 (programmed)(2)
lfuse default: 0x62 (1 Mhz internal rc)

0xE2 for 8 Mhz internal rc

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