PIC16C62B/72A
DS35008C-page 54
Preliminary
1998-2013 Microchip Technology Inc.
9.4
A/D Conversions
9.5
Use of the CCP Trigger
An A/D conversion can be started by the “special event
trigger” of the CCP1 module. This requires that the
CCP1M3:CCP1M0 bits (CCP1CON<3:0>) be pro-
grammed as
1011
and that the A/D module be enabled
(ADON bit is set). When the trigger occurs, the
GO/DONE bit will be set, starting the A/D conversion,
and the Timer1 counter will be reset to zero. Timer1 is
reset to automatically repeat the A/D acquisition period
with minimal software overhead. The appropriate ana-
log input channel must be selected and the minimum
acquisition time must pass before the “special event
trigger” sets the GO/DONE bit (starts a conversion).
If the A/D module is not enabled (ADON is cleared),
then the “special event trigger” will be ignored by the
A/D module, but will still reset the Timer1 counter.
TABLE 9-2
SUMMARY OF A/D REGISTERS
Note:
The GO/DONE bit should
NOT
be set in
the same instruction that turns on the A/D.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR,
BOR
Value on all
other Resets
0Bh,8Bh
INTCON
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x
0000 000u
0Ch
PIR1
—
ADIF
—
—
SSPIF
CCP1IF
TMR2IF
TMR1IF
-0-- 0000
-0-- 0000
8Ch
PIE1
—
ADIE
—
—
SSPIE
CCP1IE
TMR2IE
TMR1IE
-0-- 0000
-0-- 0000
1Eh
ADRES
A/D Result Register
xxxx xxxx
uuuu uuuu
1Fh
ADCON0
ADCS1 ADCS0
CHS2
CHS1
CHS0
GO/DONE
—
ADON
0000 00-0
0000 00-0
9Fh
ADCON1
—
—
—
—
—
PCFG2
PCFG1
PCFG0
---- -000
---- -000
05h
PORTA
—
—
RA5
RA4
RA3
RA2
RA1
RA0
--0x 0000
--0u 0000
85h
TRISA
—
—
PORTA Data Direction Register
--11 1111
--11 1111
Legend:
x
= unknown,
u
= unchanged,
-
= unimplemented read as '0'. Shaded cells are not used for A/D conversion.
Summary of Contents for PIC16C62B/72A
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