PIC16F7X
The following steps should be followed for doing an
A/D conversion:
4. Wait for at least an appropriate acquisition
period.
5. Start conversion:
1. Configure the A/D module:
• Set GO/DONE bit (ADCON0)
• Configure analog pins, voltage reference,
and digital I/O (ADCON1)
6. Wait for the A/D conversion to complete, by
either:
• Select A/D conversion clock (ADCON0)
• Turn on A/D module (ADCON0)
2. Configure the A/D interrupt (if desired):
• Clear ADIF bit
• Polling for the GO/DONE bit to be cleared
(interrupts disabled)
OR
• Set ADIE bit
• Waiting for the A/D interrupt
• Set PEIE bit
7. Read A/D result register (ADRES), and clear bit
ADIF if required.
• Set GIE bit
8. For next conversion, go to step 3 or step 4, as
required.
3. Select an A/D input channel (ADCON0).
FIGURE 11-1:
A/D BLOCK DIAGRAM
CHS2:CHS0
111
(1)
RE2/AN7
110
(1)
RE1/AN6
101
(1)
RE0/AN5
100
RA5/AN4
VIN
011
(Input Voltage)
RA3/AN3/VREF
010
RA2/AN2
A/D
Converter
001
RA1/AN1
000
VDD
RA0/AN0
000or
010or
100or
11x
VREF
(Reference
Voltage)
001or
011or
101
PCFG2:PCFG0
Note 1: Not available on PIC16F73/76.
2002 Microchip Technology Inc.
DS30325B-page 85
MICROCHIP [ MICROCHIP ]
