PIC18F452-I/ML【PDF 114/134 页】IC MCU FLASH 16KX16 A/D 44QFN

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Sheet目录3813

110页 111页 112页 113页 [114页]115页 116页 117页 118页

PIC16C9XX

DS30444E - page 80

1997 Microchip Technology Inc.

FIGURE 12-2: ADCON1 REGISTER (ADDRESS 9Fh)

U-0

R/W-0

—

PCFG2

PCFG1

PCFG0

R = Readable bit

W = Writable bit

U = Unimplemented

bit, read as ‘0’

- n = Value at POR reset

bit7

bit0

bit 7-3:

Unimplemented: Read as '0'

bit 2-0:

PCFG2:PCFG0: A/D Port Conguration Control bits

A = Analog input

D = Digital I/O

PCFG2:PCFG0

RA0

RA1

RA2

RA5

RA3

VREF

000

AVDD

001

VREF

RA3

010

AVDD

011

VREF

RA3

100

AVDD

111

—

The ADRES register contains the result of the A/D con-

version. When the A/D conversion is complete, the

result is loaded into the ADRES register, the GO/DONE

bit (ADCON0<2>) is cleared, and A/D interrupt ag bit

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

shown in Figure 12-3.

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

the selected channel must be acquired before the con-

version is started. The analog input channels must

have their corresponding TRIS bits selected as an

input. To determine acquisition time, see Section 12.1.

After this acquisition time has elapsed the A/D conver-

sion can be started. The following steps should be fol-

lowed for doing an A/D conversion:

Congure the A/D module:

Congure 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)

Congure A/D interrupt (if desired):

Clear ADIF bit

Set ADIE bit

Set GIE 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 register (ADRES), 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

dened as TAD. A minimum wait of 2TAD is

required before next acquisition starts.

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