8051 experiments1
- 1. 8051- Microcontroller Experiments Exp No: 17 AIM: To perform 8 bit arithmetic operations using 8051 microcontroller. A) Addition B) Subtraction C) Multiplication D) Division 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
- 2. 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
- 3. EXP NO: 18) INTERFACING OF DAC (Digital to Analog Converter)FOR GENERATIG WAVEFORMS 18 A) SQUARE WAVE GENERATION AIM. To generate square wave using DAC. PROGRAM 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 . 18 B) Generation of sawtooth wave Aim To create a sawtooth wave using DAC Program MOV DPTR, #FFC8 MOV A,#00 LOOP: MOVX @DPTR,A INC A SJMP LOOP
- 4. 18 C) Generation of triangular wave AIM To generate triangular waveform using DAC. Program 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
- 5. Exp No: 19 ) Stepper Motor Interfacing Aim To interface the stepper motor with 8051 and run it in clockwise and anticlockwise directions. Program 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 For Rotation Anticlockwise Rotation 4500 08 08 4501 01 02 4502 04 04 4503 02 01
- 6. Clock wise Anticlock wise Step A1 A2 B1 B2 Step A1 A2 B1 B2 1 1 0 0 0 8 1 1 0 0 0 8 2 0 0 0 1 1 2 0 0 1 0 2 3 0 1 0 0 4 3 0 1 0 0 4 4 0 0 1 0 2 4 0 0 0 1 1