PIC16F688-I/ST View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F688-I/ST

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F688

8.2.6 ADC REGISTER DEFINITIONS

The following registers are used to control the operation of the ADC.

REGISTER 8-1: ADCON0: A/D CONTROL REGISTER 0

R/W-0

R/W-0

U-0

R/W-0

R/W-0

ADFM

VCFG

—

CHS2

CHS1

bit 7

R/W-0

CHS0

R/W-0

GO/DONE

R/W-0

ADON

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

bit 6

bit 5

bit 4-2

bit 1

bit 0

ADFM: A/D Conversion Result Format Select bit

1 = Right justified

0 = Left justified

VCFG: Voltage Reference bit

1 = VREF pin

0 = VDD

Unimplemented: Read as ‘0’

CHS<2:0>: Analog Channel Select bits

000 = AN0

001 = AN1

010 = AN2

011 = AN3

100 = AN4

101 = AN5

110 = AN6

111 = AN7

GO/DONE: A/D Conversion Status bit

1 = A/D Conversion cycle in progress. Setting this bit starts an A/D Conversion cycle.

This bit is automatically cleared by hardware when the A/D Conversion has completed.

0 = A/D Conversion completed/not in progress

ADON: ADC Enable bit

1 = ADC is enabled

0 = ADC is disabled and consumes no operating current

REGISTER 8-2: ADCON1: A/D CONTROL REGISTER 1

U-0

R/W-0

R/W-0

R/W-0

U-0

U-0

U-0

—

ADCS2

ADCS1

ADCS0

—

—

—

bit 7

U-0

—

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

bit 6-4

bit 3-0

Unimplemented: Read as ‘0’

ADCS<2:0>: A/D Conversion Clock Select bits

000 = FOSC/2

001 = FOSC/8

010 = FOSC/32

x11 = FRC (clock derived from a dedicated internal oscillator = 500 kHz max)

100 = FOSC/4

101 = FOSC/16

110 = FOSC/64

Unimplemented: Read as ‘0’

© 2007 Microchip Technology Inc.

DS41203D-page 71

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