Page 54 - Making PIC Microcontroller Instruments and Controllers

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and thus willhave the manual for the compi ler in hand. However, some commands can
be complicated to implement and so we will spend time on them as necessary.
The compiler is kept cunent by miuoEngineering l-abs. fbr the latest MCUS rcleased
by Microchip Technology. The LAB-XI uses the 16F877A MCU, and it is the MCU of
choice, though ot}er MCUS that have a general pin-for-pin compatibilily with this
MCU may also be used. Al1 the experiments and exercises in this book will use ihe PIC
16F877A only. The compiler addresses almost all the capabilities of this MCU, and we
will cover the use of all the devjces provided on the LAB-X I board to develop the com-
forl level you need to incorporate them into your instruments afld contro]lers.
Detailed instructions lor installing the software on your PC arc prcvided in the compiler
manual. It is not necessary to install the software from a DOS prcmpt. It is much easier to
'
install it under Mndows with the Install.exe" or equivalent file provided jn each package.
"one
The software can be set up so that mouse click" will transfer the program liom
the editor to the PIC microcontroller and run the program in the PIC. In oder to do this,
you have to add a couple of functional codes to the programner operating system.
These codes tell the programmer to load the prcgram and execute it. Installing the soft
ware is covered in detail in the chapter on gefting stafted.

A SIIiIPLE EXAIIIPLE PROGRAM USII{G PICBASIC

A program that makes the LEDS blink ON and OFF is usudlly the first program writ-
ten by beginners. The pupose of the program is not to blink the LEDS but rather to allow
you to go through the programming procedures in a simple and straightforward way,
and get a result that is easy to verify. Once you have the LEDS blinking, you will know
you have followed all the steps necessary to write and execute a program, Larget morc
complicated programs may be m ch more difficult to write and debug but they are no
more difficult to compile,load, and run.
"blin}"
Progmm 4.1 outlines the keystrokes for writing and nnning tlle the LEDS pro-
gram in PICBASIC.

1i!aii0a!i!1{i!i The rlrst program (Blinkins all eishi LEDS on PORTD one ai a tlme)

nyBtinkSleds . BAS
Harpri! Singh Sandhu
Copyriqht o 2008
A11 Riqhts Reserved
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CI;EAR , clear FnM nenory
DEFINE OgC 4 , define the osc freq
I.ED ID VAR BYTE ouE !!e two d..lablec LfD ID and t
t VIR BYTE ; as 8 bi! bytes