ATmega328P datasheet(38/448 Pages) ATMEL

tên linh kiện	ATmega328P

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash

PDF	448 Pages

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nhà sản xuất	ATMEL [ATMEL Corporation]

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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

000

001

010

011

100

101

110

111

128

000

256

001

Reserved

010

Reserved

011

Reserved

100

Reserved

101

Reserved

110

Reserved

111

Reserved

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