ATMEGA8U2_14 Datasheet, PDF (299/310 Pages) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution

ATmega8U2/16U2/32U2
32. Errata
32.1 Errata ATmega8U2
The revision letter in this section refers to the revision of the ATmega8U2 device.
32.1.1 rev. A and rev B
• Full Swing oscillator
1. Full Swing oscillator
The maximum frequency for the Full Swing Crystal Oscillator is 8MHz. For Crystal frequen-
cies > 8MHz the Full Swing Crystal Oscillator is not guaranteed to operate correctly.
Problem fix/Workaround
If a Crystal with frequency > 8MHz is used, the Low Power Crystal Oscillator option should
be used instead. See table 8-1 for an overview of the Device Clocking Options. Note that the
Low Power Crystal Oscillator will not provide full rail-to-rail swing on the XTAL2 pin. If sys-
tem clock output is needed to drive other clock inputs while running from the Low Power
Crystal Oscillator, the system clock can be output on PORTC7 by programming the CKOUT
fuse.
32.2 Errata ATmega16U2
The revision letter in this section refers to the revision of the ATmega16U2 device.
32.2.1 rev. A and rev B
• Full Swing oscillator
1. Full Swing oscillator
The maximum frequency for the Full Swing Crystal Oscillator is 8MHz. For Crystal frequen-
cies > 8MHz the Full Swing Crystal Oscillator is not guaranteed to operate correctly.
Problem fix/Workaround
If a Crystal with frequency > 8MHz is used, the Low Power Crystal Oscillator option should
be used instead. See table 8-1 for an overview of the Device Clocking Options. Note that the
Low Power Crystal Oscillator will not provide full rail-to-rail swing on the XTAL2 pin. If sys-
tem clock output is needed to drive other clock inputs while running from the Low Power
Crystal Oscillator, the system clock can be output on PORTC7 by programming the CKOUT
fuse.
32.3 Errata ATmega32U2
The revision letter in this section refers to the revision of the ATmega32U2 device.
32.3.1 rev. C
No Known Errata
7799E–AVR–09/2012
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