PIC16F872SLASHSP datasheet(85/160 Pages) MICROCHIP

85 / 160 page

Preliminary

DS30221A-page 85

PIC16F872

10.0

ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

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

inputs.

The analog input charges a sample and hold capacitor.

The output of the sample and hold capacitor is the

input into the converter. The converter then generates

a digital result of this analog level via successive

approximation. The A/D conversion of the analog input

signal results in a corresponding 10-bit digital number.

The A/D module has high and low voltage reference

input that is software selectable to some combination

of VDD, VSS, RA2 or RA3.

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 clock must be derived from

the A/D’s internal RC oscillator.

The A/D module has four registers. These registers

are:

• A/D Result High Register (ADRESH)

• A/D Result Low Register (ADRESL)

• A/D Control Register0 (ADCON0)

• A/D Control Register1 (ADCON1)

The ADCON0 register, shown in Register 10-1, con-

trols the operation of the A/D module. The ADCON1

tions of the port pins. The port pins can be configured

as analog inputs (RA3 can also be the voltage refer-

ence) or as digital I/O.

Additional information on using the A/D module can be

found in the PICmicro™ Mid-Range MCU Family Ref-

erence Manual (DS33023).

R/W-0

U-0

R/W-0

ADCS1 ADCS0

CHS2

CHS1

CHS0

GO/DONE

—

ADON

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

- n = Value at POR reset

bit7

bit0

bit 7-6:

ADCS<1:0>: A/D Conversion Clock Select bits

= FOSC/2

= FOSC/8

= FOSC/32

= FRC (clock derived from an RC oscillation)

bit 5-3:

CHS<2:0>: Analog Channel Select bits

000

= channel 0, (RA0/AN0)

001

= channel 1, (RA1/AN1)

010

= channel 2, (RA2/AN2)

011

= channel 3, (RA3/AN3)

100

= channel 4, (RA5/AN4)

bit 2:

GO/DONE: A/D Conversion Status bit

If ADON = 1

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

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

is complete)

bit 1:

Unimplemented: Read as '0'

bit 0:

ADON: A/D On bit

= A/D converter module is operating

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

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