PIC16LC62B-04SLASHP datasheet(49/120 Pages) MICROCHIP

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PIC16C62B/72A

Preliminary

DS35008B-page 49

9.0

ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The analog-to-digital (A/D) converter module has five

input channels.

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

a corresponding 8-bit digital number (refer to Applica-

tion 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 approxima-

tion. The analog reference voltage is software select-

able to either the device’s positive supply voltage (VDD)

or the voltage level on the RA3/AN3/VREF pin.

The A/D converter has the 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 Figure 9-1, controls

the operation of the A/D module. The ADCON1 regis-

ter, shown in Figure 9-2, 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 dig-

ital I/O.

Note:

This section applies to the PIC16C72A

only.

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:

ADCS1:ADCS0: A/D Conversion Clock Select bits

= FOSC/2

= FOSC/8

= FOSC/32

= FRC (clock derived from an internal RC oscillator)

bit 5-3: 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)

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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