VTech Alphabert s Magic Readport User Manual download pdf (Page 32)

Lab Manual of Microcontroller & Interfacing Page 32

INC DPTR

AJMP next ; Next digit

DELAY: MOV R7,#22h

L3: MOV R6,#0FFh

L2: MOV R5,#0FFh

L1: DJNZ R5,L1

DJNZ R6,L2

DJNZ R7,L3

RET

CODE: db 0C0h,0F9h,0A4h,0B0h,99h,92h,82h,0F8h,80h,90h,00h,

END

Program 2: Interface DIP Switch with port P2 (P2.0 to P2.3). Write a program to read status

of the switch and display its HEX value on the seven segment display connected

at port P1.

Circuit diagram:

Program:

start: ORG 00h

AJMP start

ORG 03h

RETI

MOV P1,#00h ;Configure port 1 as output port

MOV P2,#0FFh ;Configure port 2 as input port

again: MOV DPTR,#CODE ;Initialize DPTR as a base address for code

MOV A,P2 ;Read status of the switch

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VTech Alphabert s Magic Readport User Manual Page 32