Datasheet

Section 15 A/D Converter
Rev.7.00 Dec. 24, 2008 Page 537 of 698
REJ09B0074-0700
15.2 Input/Output Pins
Table 15.1 summarizes the input pins used by the A/D converter. The AN0 to AN3 and AN14 to
AN15 pins are analog input pins. The VCC and VSS pins are the power supply pins for the
analog block in the A/D converter. The Vref pin is the reference voltage pin for the A/D
conversion.
Table 15.1 Pin Configuration
Pin Name Symbol I/O Function
Power supply pin VCC Input Analog block power supply and reference voltage
(also used for digital block)
Ground pin VSS Input Analog block ground and reference voltage
(also used for digital block)
Reference voltage pin Vref Input Reference voltage pin for A/D conversion
Analog input pin 0 AN0 Input
Analog input pin 1 AN1 Input
Analog input pin 2 AN2 Input
Analog input pin 3 AN3 Input
Analog input pin 14 AN14 Input
Analog input pin 15 AN15 Input
Analog input pins
A/D external trigger
input pin
ADTRG Input External trigger input pin for starting A/D
conversion
15.3 Register Descriptions
The A/D converter has the following registers.
• A/D data register A (ADDRA)
• A/D data register B (ADDRB)
• A/D data register C (ADDRC)
• A/D data register D (ADDRD)
• A/D control/status register (ADCSR)
• A/D control register (ADCR)