Embedded Microcontroller Practical Exercise $1$

Aim

To expand on the MPLAB PIC$16$F$84$ Tutorial and practice Assembly programming and Simulation.

Student Software Required

MPLAB IDE $($Ver $8\mathrm{.}92)$ on your PC or on the Remote Lab Server

Screen Capture software such as ScreenHunter

Task

The exercise is to modify the code you were given for MPLAB Tutorial to complete the following task:

Write a $1$ to bit $0$ of PORTB then wait about $5$ seconds before turning off bit $0$ and turning on bit$1.$

Continue in this way, waiting about $5$ seconds after each change and when bit$7$ has been turned off.

then turn bit $1$ on and repeat this pattern indefinitely.

Hint: Look at using the RLF $($Rotate left f through Carry$)$ command.

Method

Part $1-$ Program Development on your PC$.$

Run your PC or connect to the Remote Lab via Electromeet in the usual manner.

Locate and run the MPLAB IDE, $($on your PC or on Remote Lab $8$ on the Server$)$ then follow the steps provided in the attached help file $$DBE$\_$DBEEMC$606\_$Practical$\_$Help$.$ The code you are provided with contains all but two instructions to complete the task. The missing instructions are one that uses RLF $($Rotate Left f Through Carry$)$ and one that uses BTFSC $($Bit Test Skip if Clear$).$

Write the code to carry out the above task then Build the project and test it using the Simulator in the same way as for the Tutorial.

Set up a Watch to observe PORTB to see whether the code is executing correctly.

Once the code is operating to your satisfaction, take a screenshot of your program listing and attach it as SCREENSHOT $1$ below. $(4$ marks$)$

Take a take a screenshot of your Watch Window showing the value of PORTB as $4$ and attach it as SCREENSHOT $2$ below. $(4$ marks$)$

Now close down MPLAB and log off the server without saving any changes.