Datasheet

 1999-2013 Microchip Technology Inc. Preliminary DS41124D-page 97
PIC16C745/765
12.7 Use of the CCP Trigger
An A/D conversion can be started by the “special event
trigger” of the CCP2 module. This requires that the
CCP2M<3:0> bits (CCP2CON<3:0>) be programmed 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 12-2: SUMMARY OF A/D REGISTERS
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,
10Bh,18Bh
INTCON GIE PEIE
T0IE INTE RBIE T0IF INTF RBIF 0000 000x 0000 000u
0Ch
PIR1
PSPIF
(1)
ADIF RCIF TXIF USBIF CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000
8Ch
PIE1
PSPIE
(1)
ADIE RCIE TXIE USBIE CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000
1Eh
ADRES A/D Result Register xxxx xxxx uuuu uuuu
1Fh
ADCON0 ADCS1 ADCS0 CHS2 CHS1 CHS0 GO/
DONE
—ADON0000 00-0 0000 00-0
9Fh
ADCON1
— — — — —PCFG2PCFG1PCFG0---- -000 ---- -000
05h PORTA
— — RA5 RA4 RA3 RA2 RA1 RA0
--0x 0000 --0u 0000
85h TRISA
— — PORTA Data Direction Register
--11 1111 --11 1111
09h PORTE
— — — — —
RE2
(1)
RE1
(1)
RE0
(1)
---- -xxx ---- -uuu
89h TRISE
IBF
(1)
OBF
(1)
IBOV
(1)
PSP-MODE
(1)
—
PORTE
(1)
Data Direction Bits
0000 -111 0000 -111
Legend: x = unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used for A/D conversion.
Note 1: These bits are reserved on the PIC6C745; always maintain these bits clear.