Arduino A000053 User Manual

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7766FS–AVR–11/10
ATmega16/32U4
9.5
Rev. 7766B – 11/08
9.6
Rev. 7766A – 07/08
1.
Added ATmega16U4 device.
2.
Created errata section and added ATmega16U4.
3.
Updated High Speed Timer, asynchronous description 
Section 15. on page 139
1.
Initial revision