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PICDEM 4 User ’s Guide
Chapter 3. Tutorial
The tutorial program is preprogrammed into the sample device (for example,
p16PDEM4_Demo.hex for a PIC16XXXX device and p18PDEM4_Demo.hex for a
PIC18XXXX device). Also, this program is on the included CD-ROM program disk for
user reference (i.e., if the sample device has been reprogrammed with another
program, the tutorial may be reprogrammed into the device).
For detailed information on the PICDEM 4 hardware, please refer to Appendix A.
3.1
TUTORIAL FIRMWARE OPERATION
The PIC18F tutorial firmware is made up of two components, which are individually
displayed on the LCD. The PIC ? microcontroller ’s internal RC oscillator is used as the
system clock source.
1. Voltmeter
This mode uses the A/D module to measure the voltage of the R33 pot and dis-
plays a voltage between 0.00V and 5.00V on the LCD. Voltage is continually
updated until the mode is exited by pressing SW3 (RB0).
2. Clock
Once this mode is entered from the main menu, a real-time clock will start count-
ing from 00:00:00. The Timer1 module and a 32 kHz clock crystal is used to
establish a Real-Time Clock. By pressing SW1, the clock time can be set to the
user's preference. After SW1 has been pressed, the cursor will flash over the
hours digits. Press SW1 and the cursor will now flash over the minutes digits.
SW3 is used to increment hours and minutes whenever the cursor is flashing
over either. After the minutes have been set, press SW1 and the time will be set
and the LCD is returned to an active clock display.
The PIC16F tutorial firmware is made up of one component, which uses the comparator
module and potentiometers R12, R15, R33, and R34. Turning the potentiometers will
vary the voltages to the PIC16 inputs, thereby changing the results of the comparator
outputs. The LCD will be used for displaying these results.
? 2003 Microchip Technology Inc.
DS51337A-page 7
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