VTech Alphabert s Magic Readport User Manual download pdf (Page 23)

BM Dept., Govt. Engg. College, Gandhinagar Page 23

EXPERIMENT NO. 5

AIM: Write a program to ….

• Keep monitoring port pin P1.2 until it becomes high.

• When P1.2 becomes low, write data 45h to port P0.

• Send high to low pulse on pin P2.3.

Program 1: Keep monitoring port pin P1.2 until it becomes high.

 ORG 30h

MOV P1,#0FFh ; Configure port P1 as input port

MOV P0,#00h ; Configure port P0 as output port

CLR P2.3 ; Make port pin P2.3 low

CHECK: JNB P1.2, CHECK

MOV P0,#45h

CLR P2.3

END

Circuit Diagram:

• Construct circuit diagram on general purpose microcontroller board /simulator software.

• Assemble and link the program to generate HEX file. Download HEX file into Flash

memory of microcontroller chip 89C51.

• Press the reset button and write your comment about which LEDs are ON and OFF.

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VTech Alphabert s Magic Readport User Manual Page 23