Chapter 4. A/D Demo – PIC16C71
4.2
4.3
InitializeAD Routine
The InitializeAD routine sets up the A/D converter for use with the
PICDEM-1 board. The routine sets Ch0 through Ch3 as analog inputs, sets
the A/D to use the internal RC oscillator, selects channel 0, and clears the A/D
result register.
InitializeAD
Set Ch0-Ch3 as
analog inputs
Select RC clock
Select Ch0 as input
Turn on A/D
Clear result register
Return
Figure 4.3: Initialize A/D
SetupDelay Routine
This subroutine delays for greater than one A/D converter clock period (2 to
6 μ s when using the internal RC clock as this program does) to allow for
sampling time.
SetupDelay
Initialize loop variable
Decrement
loop variable.
No
Variable=0?
Yes
Return
Figure 4.4: Setup Delay
? 1999 Microchip Technology Inc.
DS33015C-page 17
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