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PICDEM TM Lab Development Board User’s Guide
3. All remaining code from the previous lab is unchanged. Compile the project.
There should be no errors.
3.4.6.4
TESTING THE APPLICATION
Program the PIC16F690. The LEDs connected to PORTC should now flash sequen-
tially from left-to-right when the push button is released and flash from right-to-left when
the push button is pressed.
The solution for this project is located in the
C:\PICDEM_Lab\GPIO_Labs\GPIO_Lab7\solution directory .
3.4.7
3.4.7.1
Lab 8: Using Weak Pull-Ups
NEW REGISTERS USED IN THIS LAB
To configure the peripherals used in this lab, the following registers are used:
1. OPTION Register: OPTION (Register 2-2 in Section 2 of the PIC16F690 Data
Sheet)
- Enables PORTA/PORTB weak pull-ups to be used on the PIC16F690.
2. PORTA Weak Pull-Up Register: WPUA (Register 4-5 in Section 4 of the
PIC16F690 Data Sheet)
- Selects which PORTA pins will have weak pull-ups enabled.
3.4.7.2
OVERVIEW
This lab expands on the previous lab by adding weak pull-ups to remove the 10 K Ω
used previously to tie RA2 pin to V DD . Each of the PORTA pins (except RA3) and
PORTB pins, has an individually configurable internal weak pull-up. Essentially, these
weak pull-ups perform the same task as the resistor connected to the RA2 pin and push
button as shown in Figure 3-12 only internal to the microcontroller. This feature can be
used to decrease component counts in the circuit.
Clearing the PORTA/PORTB Pull-up Enable bit, RABPU, in the OPTION register will
enable weak pull-ups on any PORTA pin selected using the Weak Pull-Up PORTA
register (WPUA).
The only change needed to the PICDEM Lab Development Board Schematic shown in
RA2.
The Initialize() is all that needs to be changed in firmware by adding the following
configurations:
? Select RA2 to have a weak pull-up by setting the Weak Pull-Up Register bit
WPUA2 in the WPUA: PORTA Register.
? Enable the PORTA/PORTB Pull-up Enable bit (RABPU) in the OPTION register
by clearing it.
3.4.7.3
PROCEDURE
Using the firmware developed in the previous lab, make the following changes:
1. Copy/paste the code in Example 3-28 into the Initialize() over the code
from the previous lab.
DS41369A-page 58
? 2009 Microchip Technology Inc.
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