PIC16F870SLASHP datasheet(85/156 Pages) MICROCHIP

85 / 156 page

Preliminary

DS30569A-page 85

PIC16F870/871

10.4

A/D Conversions

Clearing the GO/DONE bit during a conversion will

abort the current conversion. The A/D result register

pair will NOT be updated with the partially completed

A/D

conversion

sample.

That

is,

the

ADRESH:ADRESL registers will continue to contain

the value of the last completed conversion (or the last

value written to the ADRESH:ADRESL registers).

After the A/D conversion is aborted, a 2TAD wait is

required before the next acquisition is started. After

this 2TAD wait, acquisition on the selected channel is

automatically started.

In Figure 10-3, after the GO bit is set, the first time seg-

mant has a minimum of TCY and a maximum of TAD.

FIGURE 10-3: A/D CONVERSION TAD CYCLES

Note:

The GO/DONE bit should NOT be set in

the same instruction that turns on the A/D.

TAD1

TAD2

TAD3

TAD4

TAD5

TAD6

TAD7

TAD8

TAD9

Set GO bit

Holding capacitor is disconnected from analog input (typically 100 ns)

TAD10 TAD11

TCY to TAD

Conversion Starts

ADRES is loaded,

GO bit is cleared,

ADIF bit is set,

holding capacitor is connected to analog input.

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