ATmega324P datasheet(32/377 Pages) ATMEL

32 / 377 page

7674F–AVR–09/09

ATmega164P/324P/644P

Figure 7-2.

Crystal Oscillator Connections

7.3

Low Power Crystal Oscillator

This Crystal Oscillator is a low power oscillator, with reduced voltage swing on the XTAL2 out-

put. It gives the lowest power consumption, but is not capable of driving other clock inputs, and

may be more susceptible to noise in noisy environments. In these cases, refer to the “Full Swing

Crystal Oscillator” on page 33.

Some initial guidelines for choosing capacitors for use with crystals are given in Table 7-3. The

crystal should be connected as described in “Clock Source Connections” on page 31.

The Low Power Oscillator can operate in three different modes, each optimized for a specific fre-

quency range. The operating mode is selected by the fuses CKSEL3..1 as shown in Table 7-3.

Notes:

1. The frequency ranges are preliminary values. Actual values are TBD.

2. This option should not be used with crystals, only with ceramic resonators.

3. If 8 MHz frequency exceeds the specification of the device (depends on V

CC), the CKDIV8

Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured

that the resulting divided clock meets the frequency specification of the device.

The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in Table

7-4.

XTAL2

XTAL1

GND

Table 7-3.

Low Power Crystal Oscillator Operating Modes

(3)

Frequency Range(1) (MHz)

CKSEL3..1

Recommended Range for Capacitors C1

and C2 (pF)

0.4 - 0.9

100(2)

–

0.9 - 3.0

101

12 - 22

3.0 - 8.0

110

12 - 22

8.0 - 16.0

111

12 - 22

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