Analog-to-Digital Converter Peripheral Labs
FIGURE 5-1:
SCHEMATIC FOR ADC LAB 1
J 8
1
U2
20
J9
V DD
2
3
4
19
18
17
5
6
7
8
9
RC3
RC0
RC1
RC2
RB4/AN10
16
15
14
13
12
R5
100K ?
10
11
V SS
LED4
R4
470 ?
V SS
LED3
R3
470 ?
V SS
LED2
R2
470 ?
V SS
LED1
R1
470 ?
V SS
The voltage reference is software selectable as either V DD or an external voltage
applied to the external reference pin 18 (V REF ). To minimize circuit complexity, this
application makes use of V DD as the reference.
The software flowchart for this lab is shown in Figure 5-2.
FIGURE 5-2:
MAIN() SOFTWARE CONTROL LOOP FLOWCHART FOR
COMPARATOR LAB 1
main()
Global variables initialized:
? 8-bit variable LED_output will be used to
light the three LEDs connected to PORTC
Initialize()
Get_Inputs()
Loop Forever
Decide()
Do_Outputs()
? 2009 Microchip Technology Inc.
DS41369A-page 77
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