PIC16F684_07 Datasheet, PDF (67/192 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

9.0 ANALOG-TO-DIGITAL
CONVERTER (ADC) MODULE
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 VDD 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
VDD
VREF
VCFG = 0
VCFG = 1
PIC16F684
RA0/AN0
RA1/AN1/VREF
RA2/AN2
RA4/AN3
RC0/AN4
RC1/AN5
RC2/AN6
RC3/AN7
CHS <3:0>
A/D
GO/DONE
ADON
4
VSS
10
ADFM
0 = Left Justify
1 = Right Justify
10
ADRESH ADRESL
© 2007 Microchip Technology Inc.
DS41202F-page 65