PIC17C752-08SLASHCL datasheet(179/328 Pages) MICROCHIP

179 / 328 page

DS30289A-page 179

PIC17C7XX

The ADRESH:ADRESL registers contains the 10-bit

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

is complete, the result is loaded into this A/D result reg-

ister pair, the GO/DONE bit (ADCON0<2>) is cleared,

and A/D interrupt ﬂag bit ADIF is set. The block dia-

grams of the A/D module are shown in Figure 16-3.

After the A/D module has been conﬁgured as desired,

the selected channel must be acquired before the con-

version is started. The analog input channels must

have their corresponding DDR bits selected as inputs.

To determine sample time, see Section 16.1. After this

acquisition time has elapsed the A/D conversion can be

started. The following steps should be followed for

doing an A/D conversion:

Conﬁgure the A/D module:

• Conﬁgure analog pins / voltage reference /

and digital I/O (ADCON1)

• Select A/D input channel (ADCON0)

• Select A/D conversion clock (ADCON0)

• Turn on A/D module (ADCON0)

Conﬁgure A/D interrupt (if desired):

• Clear ADIF bit

• Set ADIE bit

• Clear GLINTD bit

Wait the required acquisition time.

Start conversion:

• Set GO/DONE bit (ADCON0)

Wait for A/D conversion to complete, by either:

• Polling for the GO/DONE bit to be cleared

• Waiting for the A/D interrupt

Read

A/D

Result

pair

(ADRESH:ADRESL), clear bit ADIF if required.

For next conversion, go to step 1 or step 2 as

required. The A/D conversion time per bit is

deﬁned as TAD. A minimum wait of 2TAD is

required before next acquisition starts.

FIGURE 16-3: A/D BLOCK DIAGRAM

(Input voltage)

VIN

VREF-

(Reference

voltage)

AVDD

PCFG0

CHS3:CHS0

AN7

AN6

AN5

AN4

AN3

AN2

AN1

AN0

0111

0110

0101

0100

0011

0010

0001

0000

A/D

Converter

AN11

AN10

AN9

AN8

1011

1010

1001

1000

VREF+

AVSS

AN12(1)

1011

AN13(1)

1011

AN14(1)

1011

AN15(1)

1011

(1) These channels only available on PIC16C76X devices

PIC17C752-08/CL Datasheet(PDF) 179 Page - Microchip Technology

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