Datasheet

 2002 Microchip Technology Inc. DS30325B-page 85
PIC16F7X
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 conversion clock (ADCON0)
• Turn on A/D module (ADCON0)
2. Configure the A/D interrupt (if desired):
• Clear ADIF bit
• Set ADIE bit
• Set PEIE bit
• Set GIE bit
3. Select an A/D input channel (ADCON0).
4. Wait for at least an appropriate acquisition
period.
5. Start conversion:
• Set GO/DONE
bit (ADCON0)
6. Wait for the A/D conversion to complete, by
either:
• Polling for the GO/DONE
bit to be cleared
(interrupts disabled)
OR
• Waiting for the A/D interrupt
7. Read A/D result register (ADRES), and clear bit
ADIF if required.
8. For next conversion, go to step 3 or step 4, as
required.
FIGURE 11-1: A/D BLOCK DIAGRAM
(Input Voltage)
V
IN
VREF
(Reference
Voltage)
V
DD
PCFG2:PCFG0
CHS2:CHS0
000 or
010 or
100 or
001 or
011 or
101
RE2/AN7
(1)
RE1/AN6
(1)
RE0/AN5
(1)
RA5/AN4
RA3/AN3/V
REF
RA2/AN2
RA1/AN1
RA0/AN0
111
110
101
100
011
010
001
000
A/D
Converter
Note 1: Not available on PIC16F73/76.
11x