MICRO CONTROLLER-EXPERIMENTS-8051

ADDITION
MOV R0,#00
MOV A,#DATA1
ADD A, #DATA2
JNC LABEL
INC R0
LABEL: MOV DPTR,#4150
MOVX @DPTR,A
INC DPTR
MOV A,R0
MOVX @DPTR,A
HERE: SJMP HERE




SUBTRACTION
CLR C
MOV B,#00
MOV A,#DATA1
SUBB A,#DATA2
JNC LABEL
CPL A
INC A
INC B
LABEL: MOV DPTR,#4150
MOVX @DPTR, A
INC DPTR
MOV A,B
MOVX @DPTR,A
HERE: SJMP HERE




MULTIPLICATION
MOV A, #DATA1
MOV B, A
MOV A, #DATA2
MUL AB
MOV DPTR, #4150
MOVX @DPTR, A
INC DPTR
MOV A, B
MOVX @DPTR, A
LOOP: SJMP LOOP




DIVISION
MOV A, #DATA1
MOV B,A
MOV A, #DATA2
DIV AB
MOV DPTR, #4150
MOVX @DPTR, A
INC DPTR
MOV A, B
MOV @DPTR, A
LOOP SJMP LOOP




INTERFACING OF DAC (Digital to Analog Converter)
GENERATING WAVEFORMS:-


SQUARE WAVE GENERATION
START MOV DPTR,#FFC8
MOV A,#00
MOVX @DPTR,A
LCALL DELAY
MOV A,#FF
MOVX @DPTR,A
LCALL DELAY
LJMP START
DELAY MOV R1, #05
LOOP MOV R2, #FF
HERE DJNZ R2, HERE
DJNZ R1, LOOP
RET


SAWTOOTH WAVEFORM
MOV DPTR, #FFC8
MOV A,#00
LOOP: MOVX @DPTR,A
INC A
SJMP LOOP


TRIANGULAR WAVEFORM
MOV DPTR, #FFC8
START MOV A, #00
LOOP1 MOV @DPTR,A
INC A
JNZ LOOP1
MOV A, #FF
LOOP2 MOVX @DPTR,A
DEC A
JNZ LOOP2
LJMP START


STEPPER MOTOR
Start: MOV DPTR,#4500
MOV R0,#04H
JO : MOVX A,@DPTR
PUSH DPH
PUSH DPL
MOV DPTR,#FFC0
MOV R2,#04
MOV R1,#0F
DLY1: MOV R3,#0F
DLY: DJNZ R3,DLY
DJNZ R1,DLY1
DJNZ R2,DLY1
MOVX @DPTR,A
POP DPL
POP DPH
INC DPTR
DJNZ R0,JO
SJMP START


Address            For Clockwise Rotation           For Anticlockwise Rotation
 4500                                 08                                        08       
 4501                                 01                                        02       
 4502                                 04                                        04        
 4503                                 02                                        01