MCS-51 ASEMBLER

Belajar Microkontroller adalah sesuatu hal yang mengasikkan, tetapi kadang-kadang menjadi memusingkan bila tidak ada teman atau buku yang dapat memandu untuk membuat sesuatu.

Berikut ini satu buah project kecil yang berkesinambungan, dimulai dari, penampilan angka pada Display 7-segment. Ada 6 digit display yang akan dikendalikan dengan metode Scanning.

Perangkat Pendukung untuk belajar MCS-51 anda butuh Software Simulator, Seperti Proteus dan Mide Assembler Editor & Compiler. 

Cara Kerja dan Program Assembler

$ mod51

;============================================================================================
;    6  D I G I T   D I S P L A Y   7 S E G M E N T 
;--------------------------------------------------------------------------------------------
;    Controlled by MCS-51  (Atmel 80C51 )
;--------------------------------------------------------------------------------------------
;     By BINSAR SIAGIAN 
;    Instructor of Electronic Department of TEDC BANDUNG 
;    www.tedcbandung.com
;    binsarid@yahoo.com
;--------------------------------------------------------------------------------------------
;
; Application of a Microcontroller requires an output of 7 segment display, 
; to show to the user, about what is in the doing by the application.
; One of the most important part of the Project plan that was my wake up 
; is a seven segment display with 6 digits, in order to display the article 
; and view HOURS, MINUTES, SECONDS, and calendar (ddmmyy).
;
; This section is the most basic groups of 6 major parts-making Project 
; "DIGITAL MUSIC CONTROL BELL". The sections include Digital Clock(Need Display), 
; Input Data into RAM (Need Display), calendar Control (Need Display), 
; Audio Control Amplifier, Making the Melody and control the Microphone (not Need Display).
;
; I wrote this program in the most simple, so there had seen the re-writing, 
; with the intention to be easily traced on the intent and purpose of those commands.
;
; You can change the contents of memory locations in accordance with 
; the position letter code location that you saved on buffer locations.
;
;--------------------------------------------------------------------------------------------
;        H A P P Y   E X P E R I M E N T
;======================================================

Dig0    equ    45h    ; This is RAM Addres for Data Display 
Dig1    equ    44h    ; from Digit-5 to Digit-0
Dig2    equ    43h
Dig3    equ    42h
Dig4    equ    41h
Dig5    equ    40h


        org 0000h
        ljmp Main    ; Preparation to jump from Adress Vector Interrupt



        org 0100h
Main:        mov Dig0,#0    ; Memory for Digit-5 to Digit-0 gived the Data Numbers
        mov Dig1,#1
        mov Dig2,#2
        mov Dig3,#3
        mov Dig4,#4
        mov Dig5,#5
       
        MOV DPTR,#KarakterCode    ; Pointer for the Karakter Code for Display
       
Start:        MOV A,Dig0        ; to Display Data from Digit-0 to 7 Segment
        call Jemput
        mov P1, #00000001b
        call Delay

        mov A,Dig1        ; to Display Data from Digit-1 to 7 Segment
        call Jemput
        mov P1, #00000010b
        call Delay

        mov A,Dig2        ; to Display Data from Digit-2 to 7 Segment
        call Jemput
        mov P1, #00000100b
        call Delay
       
        mov A,Dig3        ; to Display Data from Digit-3 to 7 Segment
        call Jemput
        mov P1, #00001000b
        call Delay
       
        mov A,Dig4        ; to Display Data from Digit-4 to 7 Segment
        call Jemput
        mov P1, #00010000b
        call Delay
       
        mov A,Dig5        ; to Display Data from Digit-5 to 7 Segment
        call Jemput
        mov P1, #00100000b
        call Delay
       
        ljmp Start        ; Looping to Start as Scanning Display
       
       
       
Delay:        mov r1,#100        ; Delay for ON each Display as Scanning Time
loop2:        mov r2,#30
loop1:        djnz r2,loop1       
        djnz r1,loop2
        mov P1, #00000000b    ; This is TRICK to remove Blink Display on Simulator
        ret
       
Jemput:       
        movc A,@A+DPTR        ; Fetch Character Code from Buffer locations
        mov P2,A
        ret

        org 0200h
KarakterCode:    db 11000000b    ; 0    ; Character Code for Number 0 to 9 and A charakter as HEX Number 

wrote as Binary.
        db 11111001b    ; 1    ; This Binary Number comes from variation of Segment light ON or 

OFF 
        db 10100100b    ; 2    ; as a simbol of the number. Not all can be real as Character 

but nearly
        db 10110000b    ; 3    ; simbol can be made by them.
        db 10011001b    ; 4    ; In the circuit from Port-2 comes output as active Low and 

Common Anode control from
        db 10010010b    ; 5    ; Port-1 High will Display Digit to be Light ON, and display the 

Number.
        db 10000010b    ; 6    ; All Binary number comes from connection of segment 

a,b,c,d,e,f,g to the Port-1
        db 11111000b    ; 7    ;    a to P1.0
        db 10000000b    ; 8    ;    b to P1.1
        db 10100010b    ; 9    ;    c to P1.2
        db 10001000b    ; A    ;    d to P1.3
                    ;    e to P1.4
                    ;    f to P1.5
                    ;    g to P1.6
                    ;    dot to P1.7
        END