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 2.1.2. More LED Blink

Congratulation, you have succeded with make a LED blink. Now lets improve your skill by making more LED blink ( 8 LED ). In this lesson, we will make four LED blink change reversed.

Step 1st
Build the circuit as shown in figure 2.1.2. As you seen on figure 2.1.2. P0.0 trough P0.7 is connected to LED's katode each. Remember, that all we want to do with this lesson is make four LED blink change reversed.

Figure 2.1.2. Diagram Skematik LED Blink

Step 2nd
In this step, you must tipe the assembly program to make four LED blink, we assume that you have already known the editor, we used MIDE-51 to edit the program. ( Download File : exp212.zip )

       org 0h
start: mov P0,#11110000b; Turn on LED on P0.0 - P0.3
       call delay       ; call delay time
       mov P0,#00001111b; Turn on LED on P3.4 - P0.7
       call delay; call delay time
       sjmp start; loooooop forever to start
;=============================================
;subroutine delay created to rise delay time
;=============================================
delay: mov R1,#255
del1:  mov R2,#255
del2:  djnz R2,del2
       djnz R1,del1
       ret
end