PIC16LC63A-04 Datasheet, PDF (81/184 Pages) Microchip Technology – 8-Bit CMOS Microcontrollers with A/D Converter

PIC16C63A/65B/73B/74B
The following steps should be followed for doing an A/D
conversion:
1. Configure the A/D module:
• Configure analog pins, voltage reference,
and digital I/O (ADCON1)
• Select A/D input channel (ADCON0)
• Select A/D conversion clock (ADCON0)
• Turn on A/D module (ADCON0)
2. Configure A/D interrupt (if desired):
• Clear ADIF bit (PIR1<6>)
• Set ADIE bit (PIE1<6>)
• Set PEIE bit (INTCON<6>)
• Set GIE bit (INTCON<7>)
3. Wait the required acquisition time.
4. Set GO/DONE bit (ADCON0) to start conversion.
5. Wait for A/D conversion to complete, by either:
Polling for the GO/DONE bit to be cleared (if
interrupts are disabled);
OR
Waiting for the A/D interrupt.
6. Read A/D result register (ADRES), clear bit
ADIF if required.
7. For next conversion, go to step 1 or step 2 as
required. The A/D conversion time per bit is
defined as TAD. A minimum wait of 2 TAD is
required before next acquisition starts.
FIGURE 12-1:
A/D BLOCK DIAGRAM
CHS2:CHS0
111
RE2/AN7⁽¹⁾
110
RE1/AN6⁽¹⁾
101
RE0/AN5⁽¹⁾
VIN
(Input Voltage)
100
RA5/AN4
011
RA3/AN3/VREF
A/D
Converter
010
RA2/AN2
001
RA1/AN1
VREF
VDD
000
RA0/AN0
000 or
010 or
100 or
11x
(Reference
Voltage)
001 or
011 or
101
PCFG2:PCFG0
Note 1: Not available on PIC16C73B.
 2000 Microchip Technology Inc.
DS30605C-page 81