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PIC16C925-S/CL датащи(PDF) 79 Page - Microchip Technology

номер детали PIC16C925-S/CL
подробное описание детали  64/68-Pin CMOS Microcontrollers with LCD Driver
PDF  182 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16C925-S/CL датащи(HTML) 79 Page - Microchip Technology

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 2001 Microchip Technology Inc.
Preliminary
DS39544A-page 77
PIC16C925/926
The following steps should be followed for doing an A/D
conversion:
1.
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)
2.
Configure A/D interrupt (if desired):
• Clear ADIF bit
• Set ADIE bit
• Set PEIE bit
• Set GIE bit
3.
Wait the required acquisition time.
4.
Start conversion:
• Set GO/DONE bit (ADCON0)
5.
Wait for A/D conversion to complete, by either:
• Polling for the GO/DONE bit to be cleared
(interrupts disabled)
OR
• Waiting for the A/D interrupt
6.
Read
A/D
Result
register
pair
(ADRESH:ADRESL), clear bit ADIF if required.
7.
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 10-1:
A/D BLOCK DIAGRAM
(Input Voltage)
VAIN
VREF+
(Reference
Voltage)
VDD
PCFG<3:0>
CHS<2:0>
RA5/AN4
RA3/AN3/VREF+
RA2/AN2/VREF-
RA1/AN1
RA0/AN0
100
011
010
001
000
A/D
Converter
VREF-
(Reference
Voltage)
VSS
PCFG<3:0>



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