PIC16F7X Datasheet, PDF(90/174 Page) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

PIC16F7X Datasheet, PDF (90/174 Pages) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

◁

PIC16F7X

11.7 Use of the CCP Trigger

An A/D conversion can be started by the âspecial event

triggerâ 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 âspecial event triggerâ

sets the GO/DONE bit (starts a conversion).

If the A/D module is not enabled (ADON is cleared),

then the âspecial event triggerâ 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, INTCON

10Bh, 18Bh

0Ch

PIR1

0Dh

PIR2

8Ch

PIE1

8Dh

PIE2

1Eh

ADRES

GIE PEIE TMR0IE

PSPIF(1) ADIF RCIF

â

â

â

PSPIE(1) ADIE RCIE

â

â

â

A/D Result Register

INTE

TXIF

â

TXIE

â

RBIE TMR0IF INTF RBIF 0000 000x 0000 000u

SSPIF

â

SSPIE

â

CCP1IF

â

CCP1IE

â

TMR2IF TMR1IF 0000 0000 0000 0000

â CCP2IF ---- ---0 ---- ---0

TMR2IE TMR1IE 0000 0000 0000 0000

â CCP2IE ---- ---0 ---- ---0

xxxx xxxx uuuu uuuu

1Fh

ADCON0 ADCS1 ADCS0 CHS2 CHS1 CHS0 GO/DONE â ADON 0000 00-0 0000 00-0

9Fh

ADCON1 â

â

â

â

â PCFG2 PCFG1 PCFG0 ---- -000 ---- -000

05h

PORTA

â

â

RA5

RA4

RA3

RA2

RA1 RA0 --0x 0000 --0u 0000

85h

TRISA

â

â PORTA Data Direction Register

--11 1111 --11 1111

09h

PORTE(2) â

â

â

â

â

RE2

RE1 RE0 ---- -xxx ---- -uuu

89h

TRISE(2)

IBF

OBF IBOV PSPMODE â PORTE 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: Bits PSPIE and PSPIF are reserved on the PIC16F73/76; always maintain these bits clear.

2: These registers are reserved on the PIC16F73/76.

DS30325B-page 88

ï£© 2002 Microchip Technology Inc.

▷