PIC16F7X7 datasheet(156/276 Pages) MICROCHIP

156 / 276 page

PIC16F7X7

DS30498C-page 154

 2004 Microchip Technology Inc.

ADCON2: A/D CONTROL REGISTER 2 (ADDRESS 9Bh)

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+ and RA2/AN2/VREF-/CVREF pins.

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.

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 in progress is aborted.

Each port pin associated with the A/D converter can be

configured as an analog input or as a digital I/O. The

ADRESH and ADRESL registers contain the result of

the A/D conversion. When the A/D conversion is com-

plete, 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 12-1.

U-0

R/W-0

U-0

—

ACQT2

ACQT1

ACQT0

—

bit 7

bit 0

bit 7-6

Unimplemented: Read as ‘0’

bit 5-3

ACQT<2:0>: A/D Acquisition Time Select bits

000

=0(1)

001

=2 TAD

010

=4 TAD

011

=6 TAD

100

=8 TAD

101

=12TAD

110

=16 TAD

111

=20 TAD

Note 1: If the A/D clock source is selected as RC, a time of TCY is added before the A/D

clock starts. This allows the SLEEP instruction to be executed.

bit 2-0

Unimplemented: Read as ‘0’

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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