micro controller theory pic18f appendix f final 1-4-11

8/6/2019 Micro Controller Theory PIC18F Appendix F Final 1-4-11

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APPENDIX F: TUTORIAL

FOR ASSEMBLING

AND DEBUGGING

A PIC18F ASSEMBLY

LANGUAGE PROGRAM

USING THE MPLAB

Assembling PIC18F assembly language program using MPLAB

First, download the latest versions of the MPLAB assembler and C18 compiler from the

Microchip website www.microchip.com. After installing and downloading the program,

you will see the following icon on your desktop:

MPLAB IDE v8.50.lnk

Double click (right) on the MPLAB icon and wait until you see the following screen:


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408 MicrocontrollerTheoryandApplicationswiththePIC18F

Next, click on Project and then Project Wizard; the following screen will appear:


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AppendixF:Tutorial 409

Click Next; the following screen shot will be displayed:

Select the device PIC18F4321, hit Next, and wait; the following will be displayed:


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In the Active Toolsuite, select Microchip MPASM Toolsuite, and click Next; thefollowing will be displayed:


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Select a location where all project contents will be placed. For this example, the folderwill be placed on the desktop (arbitrarily chosen). Go to the desktop directory, make a new

folder, and name the folder. In order to do this, click on Browse, and select desktop:


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Next, create a new folder by clicking on the icon (second yellow icon from right on top

row) or by right clicking on the mouse on the above window; see the following screen:

Next, click on New to see the following:


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Click on folder, name it sum (arbitrarily chosen name), and see the following :

Next, type in a le name such as addition (arbitrarily chosen name), and see the followingon the screen:


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Next, click on Save; the following screen will appear:

Click on Next, and see the following:


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Click on Next, and see the following:


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Click on File, and then New to see the following:


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Type in the program you want to assemble. The following addition program is entered:

INCLUDE

SUM EQU 0x50

ORG 0x100MOVLW 0x02

ADDLW 0x05

MOVWF SUM

HERE BRA HERE

END

After entering the program, see the following:

Next, click on File, and Save as, and see the following:


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Make sure you scroll up to desktop, and then click on sum (the folder that was created

before), and see the following:


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Next, double click (left) on sum to see the following:

Delete Untitled, and enter the same le name addition with .asm extension as File name.Click on save, and see the following screen shot (notice the display changes color):


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Next, highlight by clicking on the top (blue) section of addition.asm.mcp, and see the

following:


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Right click on Source Files to see the following:

Click on Add les to see the following:


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Click on addition.asm to see the following screen shot:


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Note that addition.asm is listed under Source Files. Next, click on Project and then build

all (or only the Build All icon, second icon on top right of the Debug toolbar), and seethe following:

Next, click on Absolute to see the following:


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On the Watch list, you can now include WREG and SUM to monitor their contents. For

example, to add WREG, scroll down to WREG by using the arrow beside ADCON0, and

then click on Add SFR to see the following display:


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Note that SUM with address 0x50 along with contents is displayed.

In order to enter breakpoint for MOVLW 0x02, right click beside MOVLW to see:

Click on set breakpoint to see the following:


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B in red means breakpoint is inserted for MOVLW0x02. Similarly, breakpoints for

ADDLW 0x05 and MOVWF SUM can be inserted, and the following will be displayed:


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Next, locate the Debug Toolbar. If, for some reason, Debug toolbar is missing, go to view,

select Toolbars, click on Debug, and see the following:

Click on the reset (rst icon from right on the Debug toolbar), move the cursor to left ofMOVLW 0x02, click on run (green arrow on left on the Debug toolbar) on Debug toolbar,

and see that WREG is loaded with 0x02:


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Next, click on run to execute ADDLW 0x05, and see that the result of addition0x07 is

loaded into WREG as follows:


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Finally, click on Animate (double green arrow on the Debug tool) to execute MOVWF

SUM to see that the result 0x07 is stored in SUM (address 0x50) as follows:

The debugging is now complete.


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micro controller theory pic18f appendix f final 1-4-11

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