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PICDEM-1 USER ’S GUIDE
Chapter 4. A/D Demo – PIC16C71
The demo71.asm program is a simple implementation of the PIC16C71’s
analog-to-digital (A/D) converter. The program reads A/D channel 0 and
displays the results on the LEDs connected to PORTB. If the potentiometer is
turned all the way clockwise, all of the LEDs are off. If the potentiometer is
turned all the way counter-clockwise, all of the LEDs are turned on.
PIC16C5X and PIC16X8X devices do not have an on-board A/D converter.
However, an external A/D circuit may be constructed in the prototype area and
the board modified to accommodate it. For more information, please refer to
AN513 – Analog to Digital Conversion Using a PIC16C54 (DS00513).
For more information on A/D module operation, please refer to the PICmicro
Midrange Microcontroller Family Reference Manual for an operational
description and a list of related application notes. For detailed information on
the PICDEM-1 hardware, please refer to Appendix A.
PORT B
PICDEM-I
LEDs
7
6
5
4
3
2
1
0
DEMO BOARD
C 1993
RN1
RN2
PIC16C54/56/58
PIC16C71/84 U2
PIC16C55/57
U3
POTENTIOMETER
R
CH0
POT
R2
Figure 4.1: A/D Demo
? 1999 Microchip Technology Inc.
DS33015C-page 15
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