Datasheet

PIC16F785/HV785

12.0 ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The analog-to-digital converter (A/D) allows conversion

of an analog input signal to a 10-bit binary representa-

tion of that signal. The PIC16F785/HV785 has twelve

analog I/O inputs, plus two internal inputs, multiplexed

into one sample and hold circuit. The output of the sam-

ple and hold is connected to the input of the converter.

The converter generates a binary result via successive

approximation and stores the result in a 10-bit register.

The voltage reference used in the conversion is soft-

ware selectable to either V

DD or a voltage applied by

the V

REF pin. Figure 12-1 shows the block diagram of

the A/D on the PIC16F785/HV785.

FIGURE 12-1: A/D BLOCK DIAGRAM

A/D

VDD

VREF

ADON

(1)

GO/DONE

VCFG = 1

VCFG = 0

CHS<3:0>

ADRESH ADRESL

ADFM

VSS

RA0/AN0/C1IN+/ICSPDAT

RA1/AN1/C12IN0-/V

REF/ICSPCLK

RA2/AN2/T0CKI/INT/C1OUT

RA4/AN3/T1G/OSC2/CLKOUT

RC0/AN4/C2IN+

RC1/AN5/C12IN1-/PH1

RC2/AN6/C12IN2-/OP2

RC3/AN7/C12IN3-/OP1

RC6/AN8/OP1-

RC7/AN9/OP1+

RB4/AN10/OP2-

RB5/AN11/OP2+

CVREF

Note 1: When ADON = 0 all input channels are disconnected from ADC (no loading).