PIC16CR74ESLASHSP datasheet(90/172 Pages) MICROCHIP

90 / 172 page

PIC16CR7X

DS21993C-page 88

11.7

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

CCP2M3:CCP2M0 bits (CCP2CON<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 an appropriate acquisi-

tion time should 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 11-2:

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

TMR0IE

INTE

RBIE

TMR0IF

INTF

RBIF

0000 000x 0000 000u

0Ch

PIR1

PSPIF(1)

ADIF

RCIF

TXIF

SSPIF

CCP1IF

TMR2IF TMR1IF 0000 0000 0000 0000

0Dh

PIR2

—

CCP2IF ---- ---0 ---- ---0

8Ch

PIE1

PSPIE(1)

ADIE

RCIE

TXIE

SSPIE

CCP1IE

TMR2IE TMR1IE 0000 0000 0000 0000

8Dh

PIE2

—

—CCP2IE ---- ---0 ---- ---0

1Eh

ADRES

A/D Result Register Byte

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

09h

PORTE(2)

—

RE2

RE1

RE0

---- -xxx ---- -uuu

89h

TRISE(2)

IBF

OBF

IBOV

PSPMODE

—

PORTE Data Direction Bits

0000 -111 0000 -111

Legend:

= unknown, u = unchanged, – = unimplemented, read as ‘0’. Shaded cells are not used for A/D conversion.

Note

1: Bits PSPIE and PSPIF are reserved on the PIC16CR73/76; always maintain these bits clear.

2: These registers are reserved on the PIC16CR73/76.

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