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19.1.3
Pin Configuration
Table 19-1 summarizes the input pins used by the A/D converter.
The AVCC and AVSS pins are the power supply pins for the analog block in the A/D converter.
The Vref pin is the A/D conversion reference voltage pin.
The 16 analog input pins are divided into two channel sets and two groups, with analog input pins
0 to 7 (AN0 to AN7) comprising channel set 0, analog input pins 8 to 15 (AN8 to AN15)
comprising channel set 1, analog input pins 0 to 3 and 8 to 11 (AN0 to AN3, AN8 to AN11)
comprising group 0, and analog input pins 4 to 7 and 12 to 15 (AN4 to AN7, AN12 to AN15)
comprising group 1.
Table 19-1 A/D Converter Pins
Pin Name
Analog power supply pin
Analog ground pin
Reference voltage pin
Analog input pin 0
Analog input pin 1
Analog input pin 2
Analog input pin 3
Analog input pin 4
Analog input pin 5
Analog input pin 6
Analog input pin 7
Analog input pin 8
Analog input pin 9
Analog input pin 10
Analog input pin 11
Analog input pin 12
Analog input pin 13
Analog input pin 14
Analog input pin 15
A/D external trigger input
pin
Symbol
I/O
AVCC
Input
AVSS
Input
Vref
Input
AN0
Input
AN1
Input
AN2
Input
AN3
Input
AN4
Input
AN5
Input
AN6
Input
AN7
Input
AN8
Input
AN9
Input
AN10
Input
AN11
Input
AN12
Input
AN13
Input
AN14
Input
AN15
Input
ADTRG
Input
Function
Analog block power supply
Analog block ground and reference voltage
A/D conversion reference voltage
Channel set 0 (CH3 = 0) group 0 analog inputs
Channel set 0 (CH3 = 0) group 1 analog inputs
Channel set 1 (CH3 = 1) group 0 analog inputs
Channel set 1 (CH3 = 1) group 1 analog inputs
External trigger input for starting A/D
conversion
747
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