.. in der SMD-Version zwei Pins zusätzlich .. ADC6 und ADC7 ..
Datenblatt lesen klingt ja schon mal gut. Bitte beachte u.a.:
1.1.9 ADC7:6 (TQFP and QFN/MLF Package Only)
In the TQFP and QFN/MLF package, ADC7:6 serve as analog inputs to the A/D converter.
These pins are powered from the analog supply and serve as 10-bit ADC channels.
und
23.9.5 DIDR0 – Digital Input Disable Register 0
• Bits 7:6 – Reserved
These bits are reserved for future use. To ensure compatibility with future devices, these bits
must be written to zero when DIDR0 is written.
..
Note that ADC pins ADC7 and ADC6 do not have digital input buffers, and therefore do not
require Digital Input Disable bits.