
2001 Microchip Technology Inc.
Advance Information
DS39582A-page 127
PIC16F87XA
The ADRESH:ADRESL registers contain the 10-bit
result of the A/D conversion. When the A/D conversion
is complete, the result is loaded into this A/D result reg-
ister pair, the GO/DONE bit (ADCON0<2>) is cleared
and the A/D interrupt flag bit ADIF is set. The block dia-
gram of the A/D module is shown in Figure 11-1.
After the A/D module has been configured as desired,
the selected channel must be acquired before the con-
version is started. The analog input channels must
have their corresponding TRIS bits selected as inputs.
To determine sample time, see Section 11.1. After this
acquisition time has elapsed, the A/D conversion can
be started.
These 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
Set ADIE bit
Set PEIE bit
Set GIE bit
Wait the required acquisition time.
Start conversion:
Set GO/DONE bit (ADCON0)
Wait for A/D conversion to complete, by either:
Polling for the GO/DONE bit to be cleared
(with interrupts enabled); OR
Waiting for the A/D interrupt
Read
A/D
result
(ADRESH:ADRESL), clear bit ADIF, if required.
For the next conversion, go to step 1 or step 2,
as required. The A/D conversion time per bit is
defined as T
AD
.
3.
4.
5.
6.
register
pair
7.
FIGURE 11-1:
A/D BLOCK DIAGRAM
(Input Voltage)
V
AIN
V
REF
+
(Reference
Voltage)
V
DD
PCFG3:PCFG0
CHS2:CHS0
RE2/AN7
(1)
RE1/AN6
(1)
RE0/AN5
(1)
RA5/AN4
RA3/AN3/V
REF
+
RA2/AN2/V
REF
-
RA1/AN1
RA0/AN0
111
110
101
100
011
010
001
000
A/D
Converter
Note
1:
Not available on 28-pin devices.
V
REF
-
(Reference
Voltage)
V
SS
PCFG3:PCFG0