Datasheet

Rev. 3.00, 03/04, page 597 of 830
18.2 Input/Output Pins
Table 18.1 summarizes the pins used by the A/D converter. The 8 analog input pins are divided
into two groups consisting of four channels. Analog input pins 0 to 3 (AN0 to AN3) comprising
group 0 and analog input pins 4 to 7 (AN4 to AN7) comprising group1.
The AVCC and AVSS pins are the power supply pins for the analog block in the A/D converter.
Table 18.1 Pin Configuration
Pin Name Symbol I/O Function
Analog power supply
pin
AVCC Input Analog block power supply
Analog ground pin AVSS Input Analog block ground and reference voltage
Reference power
supply pin
AVref Input Reference voltage for A/D conversion
Analog input pin 0 AN0 Input Group 0 analog input pins
Analog input pin 1 AN1 Input
Analog input pin 2 AN2 Input
Analog input pin 3 AN3 Input
Analog input pin 4 AN4 Input Group 1 analog input pins
Analog input pin 5 AN5 Input
Analog input pin 6 AN6 Input
Analog input pin 7 AN7 Input
A/D external trigger
input pin
ADTRG Input External trigger input pin for starting A/D
conversion