Datasheet

© 2009 Microchip Technology Inc. DS41288F-page 73
PIC16F610/616/16HV610/616
9.0 ANALOG-TO-DIGITAL
CONVERTER (ADC) MODULE
(PIC16F616/16HV616 ONLY)
The Analog-to-Digital Converter (ADC) allows
conversion of an analog input signal to a 10-bit binary
representation of that signal. This device uses analog
inputs, which are multiplexed into a single sample and
hold circuit. The output of the sample and hold is
connected to the input of the converter. The converter
generates a 10-bit binary result via successive
approximation and stores the conversion result into the
ADC result registers (ADRESL and ADRESH).
The ADC voltage reference is software selectable to
either V
DD or a voltage applied to the external reference
pins.
The ADC can generate an interrupt upon completion of
a conversion. This interrupt can be used to wake-up the
device from Sleep.
Figure 9-1 shows the block diagram of the ADC.
FIGURE 9-1: ADC BLOCK DIAGRAM
Note: The ADRESL and ADRESH registers are
read-only.
ADC
VDD
VREF
ADON
GO/DONE
VCFG = 1
VCFG = 0
CHS <3:0>
V
SS
RA0/AN0
RA1/AN1/V
REF
RA2/AN2
RA4/AN3
RC0/AN4
RC1/AN5
RC2/AN6
RC3/AN7
CVREF
0.6V Reference
1.2V Reference
ADRESH ADRESL
10
10
ADFM
0 = Left Justify
1 = Right Justify
4