PIC16C72-02E/SP View Datasheet(PDF) - Microchip Technology
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PIC16C72-02E/SP Datasheet PDF : 124 Pages
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PIC16C72 Series
9.4 A/D Conversions
Note: The GO/DONE bit should NOT be set in
the same instruction that turns on the A/D.
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 is 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 (moving the ADRES to
the desired location). The appropriate analog input
channel must be selected and the minimum acquisition
done 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 REGISTERS/BITS ASSOCIATED WITH 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
0Ch
8Ch
1Eh
1Fh
9Fh
INTCON GIE PEIE T0IE INTE RBIE T0IF
INTF RBIF 0000 000x
PIR1
— ADIF — — SSPIF CCP1IF TMR2IF TMR1IF -0-- 0000
PIE1
— ADIE — — SSPIE CCP1IE TMR2IE TMR1IE -0-- 0000
ADRES A/D Result Register
xxxx xxxx
ADCON0 ADCS1 ADCS0 CHS2 CHS1 CHS0 GO/DONE —
ADON 0000 00-0
ADCON1 —
—
—
—
—
PCFG2 PCFG1 PCFG0 ---- -000
0000 000u
-0-- 0000
-0-- 0000
uuuu uuuu
0000 00-0
---- -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.
DS39016A-page 58
Preliminary
© 1998 Microchip Technology Inc.
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