Assignment -Microprocessor

Assignment 1:-

1.

Analyze the architecture and pin diagram of 8085 microprocessor.

2.

Understand and describe the internal operations of

i)

DMA Controller,8257

ii)

Programmable Interval timer,8254

iii)

Programmable Peripheral interface,8255

3.

Understand and describe the internal operations of

(1)

Programmable Interrupt controller,8259

(2)

USART,8251

(3)

Programmable Keyboard and Display Interface.8279

Assignment 2:-

4.

Analyze the architecture and pin diagram of 8051 microcontroller.

5.

Analyze the architecture and pin diagram of 8086 microprocessor.

6.

Compare and contrast differences between microprocessor and microcontroller  (viz., register structure and addressing modes, instruction set).

INTERFACING STEPPER MOTOR USING 8085.

INTERFACING STEPPER MOTOR USING 8085.

INTERFACING 8255 WITH 8085

AIM:

            To interface  stepper motor using programmable peripheral interface 8255 with 8085 and study its characteristics in I/O-mode.0

KITS REQUIRED:

            8085 mp kit,  DC regulated power supply, 26 pin frc cable ,stepper motor interface ,stepper motor

Programmable Peripheral Interface 8255

 I/O MODES:

            Control Word:

MODE 0 – SIMPLE I/O MODE:

                                  This mode provides simple I/O operations for each of the three ports and is suitable for synchronous data transfer. In this mode all the ports can be configured either as input or output port.

            Let us initialize port A,B,C  as output port

ADDRESS	OPCODE	LABEL	MNEMONICS	OPERAND	COMMENT
8C00			MVI	A,80	All ports are o/p ports
8C01
8C02			OUT	43H	Out to control reg
8C03
8C04			MVI	A,88	Initialize bit pattern
8C05
8C06		LOOP	OUT	40H	PA0-PA3 bit control the motor
8C07
8C08			CALL	DELAY (8C20)
8C09
8C0A
8C0B			RRC/RLC		To rotate left or right
8C0C			JMP	LOOP
8C0D
8C0E
		DELAY PROGRAM
8c20		delay	PUSH	PSW
ADDRESS	OPCODE	LABEL	MNEMONICS	OPERAND	COMMENT
8C21			LXI	H,0001
8C22
8C23
8C24		D2	LXI	D,FFFF
8C25
8C26
8C27		D3	DCX	D
8C28			MOV	A,E
8C29			ORA	D
8C2A			JNZ	D3
8C2B
8C2C
8C2D			DCX	H
8C2E			MOV	A,H
8C2F			ORA	L
8C30			JNZ	D2
8C31
8C32
8C33			POP	PSW
8C34			RET

OBSERVATION:

Microprocessor-8085-LARGEST/SMALLEST ELEMENT IN AN ARRAY

LARGEST ELEMENT IN AN ARRAY

AIM:

                To find the largest element in an array.

ALGORITHM:

1. Place all the elements of an array in the consecutive memory locations.
2. Fetch the first element from the memory location and load it in the accumulator.
3. Initialize a counter (register) with the total number of elements in an array.
4. Decrement the counter by 1.
5. Increment the memory pointer to point to the next element.
6. Compare the accumulator content with the memory content  (next  element).
7. If the accumulator content is smaller, then move the memory content  (largest element) to the accumulator. Else continue.
8. Decrement the counter by 1.
9. Repeat steps 5 to 8, until the counter reaches zero.
10. Store the result (accumulator content) in the specified memory location.

RESULT:

                Thus the largest number in the given array is found out.

PROGRAM:

ADDRESS	OPCO DE	LABEL	MNEMONICS	OPERAND	COMMENTS
8001			LXI	H,8100	Initialize HL reg. to 8100H
8002
8003
8004			MVI	B,04	Initialize B reg with no. of comparisons (n-1)
8005
8006			MOV	A,M	Transfer first data to acc.
8007		LOOP1	INX	H	Increment HL reg.  to point next memory location
8008			CMP	M	Compare M & A
8009			JNC	LOOP	If A is greater than M then go to loop
800A
800B
800C			MOV	A,M	Transfer data from M to A reg
800D		LOOP	DCR	B	Decrement B reg
800E			JNZ	LOOP1	If B is not Zero go to loop1
800F
8010
8011			STA	8105	Store the result in a memory location.
8012
8013
8014			RST 5		Stop the program

OBSERVATION:

INPUT		OUTPUT
ADDRESS	DATA	ADDRESS		DATA
8100		8105
8101
8102
8103
8104

 SMALLEST ELEMENT IN AN ARRAY

AIM:

To find the smallest element in an array.

ALGORITHM:

1. Place all the elements of an array in the consecutive memory locations.
2. Fetch the first element from the memory location and load it in the accumulator.
3. Initialize a counter (register) with the total number of elements in an array.
4. Decrement the counter by 1.
5. Increment the memory pointer to point to the next element.
6. Compare the accumulator content with the memory content  (next  element).
7. If the accumulator content is smaller, then move the memory content  (largest element) to the accumulator. Else continue.
8. Decrement the counter by 1.
9. Repeat steps 5 to 8  until the counter reaches zero
10. Store the result (accumulator content) in the specified memory location.

RESULT:

          Thus the smallest number in the given array is found out.

PROGRAM:

ADDRESS	OPCODE	LABEL	MNEMONICS	OPERAND	COMMENTS
8001			LXI	H,8100	Initialize HL reg. to 8100H
8002
8003
8004			MVI	B,04	Initialize B reg with no. of comparisons (n-1)
8005
8006			MOV	A,M	Transfer first data to acc.
8007		LOOP1	INX	H	Increment HL reg.  to point next memory location
8008			CMP	M	Compare M & A
8009			JC	LOOP	If A is lesser than M then go to loop
800A
800B
800C			MOV	A,M	Transfer data from M to A reg
800D		LOOP	DCR	B	Decrement B reg
800E			JNZ	LOOP1	If B is not Zero go to loop1
800F
8010
8011			STA	8105	Store the result in a memory location.
8012
8013
8014			RST 5		Stop the program

OBSERVATION:

INPUT		OUTPUT
ADDRESS	DATA	ADDRESS		DATA
8100		8105
8101
8102
8103
8104