Part Iii 8051 General Pgms 3if1a

Lab 6 Ex.No.6: BCD To Hexadecimal Conversion And Hexadecimal To BCD Conversion 6.1 Introduction: The purpose of this experiment is to obtain the BCD to HEXADECIMAL and viceversa of a given data using 8051 micro controller trainer kit. 6.2 Hardware Requirement: The 8051 Microcontroller kit, Power supply. 6.3 Program Logic: In this program, 8 bit two digit Hexadecimal number system into BCD number system. The hexadecimal number system (also called base-16) is a number system that uses 16 unique symbols to represent a particular value. Those symbols are 0-9 and A-F. 8 bit two digit BCD number system into Hexadecimal number system. Binary coded decimal (BCD) is a system of writing numerals that assigns a four-digit binary code to each digit 0 through 9 in a decimal (base-10) numeral. 6.4 Program: BCD to HEXADECIMAL: LABEL

MNEMONICS MOV DPTR,#4600 MOVX A,@DPTR MOV R5,A ANL A,#F0 SWAP A MOV R1,A MOV A,R5 ANL A,#0F MOV R2,A MOV A,R1 MOV F0,#0A

MUL AB ADD A,R2 INC DPTR MOVX @DPTR,A SJMP HERE HERE Hexadecimal to BCD LABEL

MNEMONICS MOV DPTR,#4600 MOVX A,@DPTR MOV F0,#64 DIV AB INC DPTR MOVX @DPTR,A MOV A,F0 MOV F0,#0A DIV AB SWAP A ADD A,F0 INC DPTR MOVX @DPTR,A

HERE

SJMP HERE

6.4 Pre-Lab Questions: 1. Upon reset, all ports of the 8051 are configured as _____________ (output, input). 2. Which ports of the 8051 have internal pull-up resistors? 3. Which ports of the 8051 require the connection of external pull-up resistors in order to be used for I/O? Show the drawing for the connection.

6.5 Post-Lab Questions: 1. How the DPTR is classified, explain its functions? 2. What is the function of EA pin in 8051? 3. List out the special function s in 8051.

Lab 7 Ex.No.7: ASCII To Decimal Conversion And Decimal To ASCII Conversion 7.1 Introduction: The purpose of this experiment is to obtain the ASCII To Decimal and vice versa of a given data using 8051 micro controller trainer kit. 7.2 Hardware Requirement: The 8051 Microcontroller kit, Power supply. 7.3 Program Logic: In this program, 8 bit two digit ASCII number system into decimal number system. Acronym for the American Standard Code for Information Interchange. Pronounced ask-ee, ASCII is a code for representing English characters as numbers, with each letter assigned a number from 0 to 127 into decimal number and vice versa.

7.4 Program: ASCII to DECIMAL: LABEL

MNEMONICS MOV DPTR,#4500 MOV A,#DATA CLR C SUBB A,#30 CLR C SUBB A,#0A JC STR MOV A,#0FF SJMP LOOP

STR

ADD A,#0A

LOOP

MOVX @DPTR,A

HERE

SJMP HERE

DECIMAL TO ASCII:

LABEL

MNEMONICS

MOV DPTR,#4500 MOVX A,@DPTR MOV R0,#30 ADD A,R0 INC DPTR MOVX @DPTR,A HERE

SJMP HERE

7.5 Pre-Lab Questions: 1. What is the major difference between 8051 and 8086? 2. What is meant by the term immediate addressing? 3. There is no stop instruction in the 8051 instruction. Describe a method for implementing a program stop. 7.6 Post-Lab Questions: 1. Write an assembly language program to find one’s and two’s complement without using L instruction. 2. What are the two s in 8051 which are used for indirect addressing? 3. What is the function of program counter in 8051? 4. Explain the bit level logical instructions of 8051.

Lab 8

Ex.No.8: Square Root Of A Given Data 8.1 Introduction: The purpose of this experiment is to obtain the Square root of a given data using 8051 micro controller trainer kit. 8.2 Hardware Requirement: The 8051 Microcontroller kit , Power supply. 8.3 Program Logic: In this program, the square root of a number can be found out by division and subtraction method. 8.4 Program: LABEL

MNEMONICS MOV DPTR,#5600 MOVX A,@DPTR MOV R1,A MOV R2,#01

LOOP

MOV A,R1 MOV F0,R2 DIV AB MOV R3,A MOV R4,F0 SUBB A,R2 JZ RESULT INC R2 SJMP LOOP

RESULT

MOV DPTR,#5700 MOV A,R3 MOVX @DPTR,A

HERE

SJMP HERE

8.5 Pre-Lab Questions:

1. Why are program counter and stack pointer are 16-bit s? 2. What are banks? 3. Mention any 3 applications of microcontroller? 4. How to program the microcontroller 89C51? 8.6 Post-Lab Questions: 1.

Explain power down mode of 8051.

2.

Explain the function of RXD and TXD pins of 8051 microcontroller.

3.

Explain the reset circuit in 8051.

4.

What is the difference between power-on reset and manual reset?