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General Purpose Input/Output Labs
FIGURE 3-18:
PICDEM LAB SCHEMATIC FOR GPIO INPUT LABS
V DD
R9
J8
1
2
U2
20
19
J9
10K ?
3
4
5
6
7
8
9
10
RC5
RC4
RC3
RC6
RC7
RA2
RC0
RC1
RC2
18
17
16
15
14
13
12
11
SW1
V SS
R8
470 ?
LED8
R7
470 ?
LED7
R6
470 ?
LED6
R5
470 ?
LED5
R4
470 ?
LED4
R3
470 ?
LED3
R2
470 ?
LED2
R1
470 ?
LED1
V SS
The only change from the previous section is the inclusion of a push button connected
to RA2 with associated pull-up resistor.
3.4.4
3.4.4.1
Lab 5: Adding a Push Button
NEW REGISTERS USED IN THIS LAB
To configure the peripherals used in this lab, the following registers are used:
1. PORTA Register: PORTA (Register 4-1 in Section 4 of the PIC16F690 Data
Sheet)
- 8-bit bidirectional port
2. PORTA Tri-State Register: TRISA (Register 4-2 in Section 4 of the PIC16F690
Data Sheet)
- Configures corresponding bits in PORTA as either input or output
3.4.4.2
OVERVIEW
This lab expands upon Lab 4 by adding a push button interface to change the direction
of the sequential shift in the PORTC register.
Mechanical switches play an important and extensive role in practically every
computer, microprocessor and microcontroller application. Mechanical switches are
inexpensive, simple and reliable. However, switches can be very noisy electrically. The
apparent noise is caused by the closing and opening action that seldom results in a
clean electrical transition. The connection makes and breaks several, perhaps even
hundreds, of times before the final switch state settles. The problem is known as switch
bounce. Some of the intermittent activity is due to the switch contacts actually bouncing
off each other. Also, switch contacts are not perfectly smooth. As the contacts move
against each other, the imperfections and impurities on the surfaces cause the
electrical connection to be interrupted. The result is switch bounce. The consequences
? 2009 Microchip Technology Inc.
DS41369A-page 39
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