ATmega162 datasheet(42/324 Pages) ATMEL

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2513K–AVR–07/09

ATmega162/V

• Bits 3..0 – CLKPS3..0: Clock Prescaler Select Bits 3 - 0

These bits define the division factor between the selected clock source and the internal system

clock. These bits can be written run-time to vary the clock frequency to suit the application

requirements. As the divider divides the master clock input to the MCU, the speed of all synchro-

nous peripherals is reduced when a division factor is used. The division factors are given in

Table 15.

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 15. Clock Prescaler Select

CLKPS3

CLKPS2

CLKPS1

CLKPS0

Clock Division Factor

000

001

010

011

128

100

256

100

Reserved

101

Reserved

101

Reserved

110

Reserved

110

Reserved

111

Reserved

111

Reserved

ATmega162 Datenblatt(PDF) 42 Page - ATMEL Corporation

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