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P40 to P47 (pins used for AN0 to AN7 and DA0 to DA1), P54 to P57 (pins used for AN12 to
AN15 and DA2 to DA3) Vcc, AVcc, AVss, and Vref: Pins P50 to P57 are also used for interrupt
inputs. When the user system is not connected and pull-up resistors are removed, input will be
undefined and may illegally detect an interrupt. When P50 to P57 are used to input interrupt
signals, it is recommended to connect the pull-up resistors to these pins.
Figure 2.4 User System Interface Circuit for P40 to P47, P54 to P57, Vcc, AVcc, AVss, and
Vref Signals
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