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ATmega328P Datasheet(PDF) 38 Page - ATMEL Corporation

Part # ATmega328P
Description  8-bit Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash
PDF  448 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega328P Datasheet(HTML) 38 Page - ATMEL Corporation

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38
8161D–AVR–10/09
ATmega48PA/88PA/168PA/328P
The CKDIV8 Fuse determines the initial value of the CLKPS bits. If CKDIV8 is unprogrammed,
the CLKPS bits will be reset to “0000”. If CKDIV8 is programmed, CLKPS bits are reset to
“0011”, giving a division factor of 8 at start up. This feature should be used if the selected clock
source has a higher frequency than the maximum frequency of the device at the present operat-
ing conditions. Note that any value can be written to the CLKPS bits regardless of the CKDIV8
Fuse setting. The Application software must ensure that a sufficient division factor is chosen if
the selected clock source has a higher frequency than the maximum frequency of the device at
the present operating conditions. The device is shipped with the CKDIV8 Fuse programmed.
Table 8-17.
Clock Prescaler Select
CLKPS3
CLKPS2
CLKPS1
CLKPS0
Clock Division Factor
0
000
1
0
001
2
0
010
4
0
011
8
0
100
16
0
101
32
0
110
64
0
111
128
1
000
256
1
001
Reserved
1
010
Reserved
1
011
Reserved
1
100
Reserved
1
101
Reserved
1
110
Reserved
1
111
Reserved



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