PIC16F716-I/P View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F716-I/P

8-bit Flash-based Microcontroller with A/D Converter and Enhanced Capture/Compare/PWM

Microchip Technology 

PIC16F716

8.0 ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The Analog-to-Digital (A/D) Converter module has four

inputs.

The A/D allows conversion of an analog input signal to

a corresponding 8-bit digital number (refer to

Application Note AN546 for use of A/D Converter). The

output of the sample and hold is the input into the

converter, which generates the result via successive

approximation. The analog reference voltage is

software selectable to either the device’s positive

supply voltage (VDD) or the voltage level on the RA3/

AN3/VREF pin.

The A/D converter has a unique feature of being able

to operate while the device is in Sleep mode. To

operate in Sleep, the A/D conversion clock must be

derived from the A/D’s internal RC oscillator.

Additional information on the A/D module is available in

the PICmicro® Mid-Range Reference Manual,

(DS33023).

The A/D module has three registers. These registers

are:

• A/D Result Register (ADRES)

• A/D Control Register 0 (ADCON0)

• A/D Control Register 1 (ADCON1)

A device Reset forces all registers to their Reset state.

This forces the A/D module to be turned off and any

conversion is aborted.

The ADCON0 register, shown in Register 8-1, controls

the operation of the A/D module. The ADCON1

register, shown in Register 8-2, configures the

functions of the port pins. The port pins can be

configured as analog inputs (RA3 can also be a voltage

reference) or as digital I/O.

REGISTER 8-1: ADCON0 REGISTER (ADDRESS: 1Fh)

R/W-0 R/W-0 R/W-0 R/W-0

ADCS1

bit 7

ADCS0

CHS2

CHS1

R/W-0

CHS0

R/W-0

R/W-0

GO/DONE

—

R/W-0

ADON

bit 0

bit 7-6

bit 5-3

bit 2

bit 1

bit 0

ADCS1:ADCS0: A/D Conversion Clock Select bits

00 = FOSC/2

01 = FOSC/8

10 = FOSC/32

11 = FRC (Clock derived from the internal ADC RC oscillator)

CHS2:CHS0: Analog Channel Select bits

000 = channel 0, (RA0/AN0)

001 = channel 1, (RA1/AN1)

010 = channel 2, (RA2/AN2)

011 = channel 3, (RA3/AN3)

1xx = reserved, do not use

GO/DONE: A/D Conversion Status bit

If ADON = 1

1 = A/D conversion in progress (Setting this bit starts the A/D conversion)

0 = A/D conversion not in progress (This bit is automatically cleared by hardware when the A/D

conversion is complete)

Reserved: Maintain this bit as '0'

ADON: A/D On bit

1 = A/D converter module is operating

0 = A/D converter module is shutoff and consumes no operating current

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

 2003 Microchip Technology Inc.

Preliminary

DS41206A-page 49

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