Datasheet

 2011 Microchip Technology Inc. Preliminary DS41576B-page 101
PIC12F752/HV752
12.0 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 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 12-1 shows the block diagram of the ADC.
FIGURE 12-1: ADC BLOCK DIAGRAM
Note: The ADRESL and ADRESH registers are
read-only.
AN0
A/D
AN1/VREF+
AN2
VDD
VREF+
ADON
GO/DONE
VCFG = 1
VCFG = 0
CHS<3:0>
Vss
dac_ref
fvr_ref
AN3
ADRESH ADRESL
10
10
ADFM
0 = Left Justify
1 = Right Justify
0000
0001
0010
0011
1110
1111