DM163006 datasheet(195/320 Pages) MICROCHIP

195 / 320 page

 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 195

PIC18C601/801

ADCON2 REGISTER

The analog reference voltage is software selectable to

either the device’s positive and negative supply

voltage (VDD and VSS), or the voltage level on the

RA3/AN3/VREF+ pin and RA2/AN2/VREF-.

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

to operate while the device is in SLEEP mode. To oper-

ate in SLEEP, the A/D conversion clock must be

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

The output of the sample and hold is the input into the

converter, which generates the result via successive

approximation.

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.

Each port pin associated with the A/D converter can

be configured as an analog input (RA3 can also be a

voltage reference), or as a digital I/O.

The ADRESH and ADRESL registers contain the

result of the A/D conversion. When the A/D conver-

sion is complete, the result is loaded into the

ADRESH/ADRESL

registers,

the

GO/DONE

bit

(ADCON0 register) is cleared, and A/D interrupt flag

bit ADIF is set. The block diagram of the A/D module

is shown in Figure 17-1.

R/W-0

U-0

R/W-0

ADFM

—

ADCS2

ADCS1

ADCS0

bit 7

bit 0

bit 7

ADFM: A/D Result Format Select bit

= Right justified

= Left justified

bit 6-3

Unimplemented: Read as '0'

bit 2-0

ADCS2:ADCS0: A/D Conversion Clock Select bits

000

= FOSC/2

001

= FOSC/8

010

= FOSC/32

011

= FRC (clock derived from an internal RC oscillator = 1 MHz max)

100

= FOSC/4

101

= FOSC/16

110

= FOSC/64

111

= FRC (clock derived from an internal RC oscillator = 1 MHz max)

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

’1’ = Bit is set

’0’ = Bit is cleared

x = Bit is unknown

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