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XMEGA A [MANUAL]
8077I–AVR–11/2012
automatic run-time calibration of the oscillator to compensate for temperature and voltage drift and optimize the oscillator
accuracy. This oscillator can also be adjusted and calibrated to any frequency between 30MHz and 55MHz.
7.4.1.4 2MHz Run-time Calibrated Oscillator
The 2MHz run-time calibrated internal oscillator is the default system clock source after reset. It is calibrated during
production to provide a default frequency close to its nominal frequency. A DFLL can be enabled for automatic run-time
calibration of the oscillator to compensate for temperature and voltage drift and optimize the oscillator accuracy.
7.4.2
External Clock Sources
The XTAL1 and XTAL2 pins can be used to drive an external oscillator, either a quartz crystal or a ceramic resonator.
XTAL1 can be used as input for an external clock signal. The TOSC1 and TOSC2 pins is dedicated to driving a
32.768kHz crystal oscillator.
7.4.2.1 0.4MHz - 16MHz Crystal Oscillator
This oscillator can operate in four different modes optimized for different frequency ranges, all within 0.4MHz - 16MHz.
Figure 7-2 shows a typical connection of a crystal oscillator or resonator.
Figure 7-2.
Crystal oscillator connection.
Two capacitors, C1 and C2, may be added to match the required load capacitance for the connected crystal.
7.4.2.2 External Clock Input
To drive the device from an external clock source, XTAL1 must be driven as shown in Figure 7-3 on page 82. In this
mode, XTAL2 can be used as a general I/O pin.
Figure 7-3.
External clock drive configuration.
7.4.2.3 32.768kHz Crystal Oscillator
A 32.768kHz crystal oscillator can be connected between the TOSC1 and TOSC2 pins and enables a dedicated low
frequency oscillator input circuit. A typical connection is shown in Figure 7-4 on page 83. A low power mode with reduced
voltage swing on TOSC2 is available. This oscillator can be used as a clock source for the system clock and RTC, and as
the DFLL reference clock.
C1
C2
XTAL2
XTAL1
GND
General
Purpose
I/O
XTAL2
XTAL1
External
Clock
Signal
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