Micro Processor & Micro Controller Practical Notes_Electrical Engineering GTU.pdf

Gajjar Parth Sunilkmar
180420109009
ELE(M) 3rd
YR
Micro Processor & Micro Controller
May 2021
30th
April, 2021

INDEX PAGE
MPMC 180420109009
SR No. DESCRIPTION DATE
1. Study of Block Diagram and Pin diagram of 8051 microcontroller 08 Feb. 2021
2. Introduction to KEIL μVISION4 IDE, assembler, compiler, linker,
simulator, debugger and assembler directives
08 Feb. 2021
3.
Block Data Transfer:
1. Internal RAM to Internal RAM data Transfer
2. External RAM to Internal RAM data Transfer
3. Code Memory to Internal RAM data transfer
4. Reverse Block of Data in internal RAM
5. Data Transfer with overlapping addresses
15 Feb. 2021
4.
1. Finding Washing Machine and TV Set code from a set of data
2. Find the number of vowels from a string available in code
memory.
3. Separate ODD/Even Numbers
4.Separate POSITIVE/NEGATIVE Numbers
08 Mar. 2021
5.
Code Conversion & Multibyte deminal addition
1. Hex to ASCII conversion using subroutine
2. ASCII to Hex comversion
3. Hex to BCD digit Separation
4. BCD to Hex conversion
5. Multibyte decimal number addition
22 Mar. 2021
6.
Port Programming
1. Indicate the status of S/W pressed on LED
2. If S1 is pressed then display 55H and if S2 is pressed Display
0AAH.
29 Mar. 2021
7.
Timer Programming
1. Generate a Square wave of 1 kHz frequency on P1.0 pin using
timer-0 in mode-1.
2. Generate a Square wave of 1 kHz frequency on P1.0 pin using
timer-0 in mode-2.
3. Update and display real time second on port-0 using timer-0 in
mode-1
5 April. 2021
8.
Seven Segment Display
1. Draw an Interfacing scheme to interface four common
cathode seven-segment LEDs with 8051 and using this interfacing
scheme write an embedded 'C' program to dipslay passing year.
2. Write an embedded 'C' program that updates and displays
real-time second and minute on 4-digit common cathode seven
segment display
26 April 2021
9.
LCD Display Draw an Interfacing scheme to interface 20x2 LCD
display with 8051.
1. Write an embedded 'c' program that displays "-- Welcome To--
"in line-1 and "--SCET, SURAT--" in line-2 of LCD display.
2. Write an embedded ‘c’ program that updates and displays
Real-Time Clock data on LCD.
26 April 2021
10. Serial Communication 26 April 2021

INTRODUCTION TO
KEIL VISION IDE AND
OTHERS
NAME : Gajjar Parth Sunilkumar
Enrollment : 180420109009
Submitted To :
1. Dr. Nilesh Shah
2. Prof. Dimple Bhanabhagwanwala
Date Of Submission : 27th
February, 2021

MPMC 180420109009
INTRODUCTION TO KEIL VISION IDE AND OTHERS
AIM :
Introduction to KEIL μVISION4 IDE, assembler, compiler, linker, simulator,
debuggerand assembler directives. Study of software development cycle using KEIL
IDE.
INTRODUCTION TO KEIL μVISION4 IDE :
− The Keil C51 development tools offer numerous features and advantages that
help you to develop embedded applications quickly and successfully. Find out
more about the supported devices and the possible tool combinations available
for the different 8051 variants.
− The following block diagram shows the components involved in the build process.

MPMC 180420109009
µVISION INTEGRATED DEVELOPMENT ENVIRONMENT (IDE) :
− The µVision4 IDE is a window-based software development tool that combines
project management and a rich-featured editor with interactive error
correction, option setup, make facility, and on-line help.
− Use µVision4 to create source files and organize them into a project that
defines your target application.
C COMPILER : The Keil Cx51 Compiler is a full ANSI implementation of the C
programming language and supports all standard features of the C language. In
addition, numerous extensions have been included to directly support the 8051
and extended 8051 architecture.
MACRO ASSEMBLER : The Keil Ax51 Macro Assembler supports the
complete instruction set of the 8051 and all 8051 derivatives.
LIBRARY MANAGER : The LIBx51 Library Manager allows you to create the
object library from object files created bythe compiler and assembler. Libraries
are specially formatted, ordered program collections of object modules that may
be used by the linker at a later time. When the linker processes a library, only
those object modules necessary to create the program are used.
LINKER/LOCATER : The Lx51 Linker/Locater creates the final executable
8051 program and combines the object files created by the compiler or
assembler, resolves external and public references, and assigns absolute
addresses. In addition, it selects and includes the appropriate run-time library
modules.

MPMC 180420109009
µVISION4 DEBUGGER :
The µVision4 Debugger is ideally suited for fast and reliable program debugging.
The debugger includes a high-speed simulator capable of simulating an entire
8051 system including on-chip peripherals and external hardware.
The µVision4 Debugger provides several ways to test programs on target
hardware:
− Use the Keil ULINK USB-JTAG adapter for downloading and testing your
program.
− Install a target monitor on your target system and download your program
using the built-in monitor interface of the µVision Debugger.
− Use the Advanced GDI interface to attach and use the µVision4 Debugger
front end with your target system.
RTOS KERNEL :
The RTOS Kernel, describes the advantages of using a real-time kernel like the Keil
RTX51 Tiny in embedded systems.

MPMC 180420109009
STEPS FOR SOFTWARE DEVELOPMENT USING KEIL
µVERSION4 IDE
Step-1 : Open keil µversion4 IDE :
Open keil µversion4 IDE, the window screen look like as shown below.

MPMC 180420109009
Step:-2 : create new project, save project and select device :
Select an empty folder and enter the project name, for example Project. The
fileextension is *.UVPROJ for MDK version 4, or .UVPROJX for later versions.

MPMC 180420109009
Select device for a project [NXP (founded by Philips) in select Device Dialog box]
Then select P89V51RD2 microcontroller from device database for NXP
Semiconductor.

MPMC 180420109009
Step-3 : Configure project, set frequency, enable hex file
generation, specify memory blocks :
Select options for target by right click on Target and set frequency.
Select output options for target and tick on Create option for generating Hex file
during Buildproject.

MPMC 180420109009
Step-4 : Develop Source file by opening editor and save it with
.A51 or .C
Using the menu or toolbar, Create a source file with the menu File - New. This
opens anempty file in the editor window.
Write any Program using editor and save the file (menu File - Save As) to
make useof the syntax coloring feature.

MPMC 180420109009
Step-5 : Add source file to source group.
You can add files in several ways to a project. The most common way is to click on a
Source group in the window Project and use the context menu Add New Item to
Group
or Add Existing Files to Group.
By clicking ADD button the file will be added in group in the project.

MPMC 180420109009
Step-6: Build the target by clicking on Project menu and then
Build Target option.
The Build Output window displays errors, warnings, and build messages during
the build process. Double-click a message to open the corresponding source file for
correction and again build target until there is zero error and no warning.

MPMC 180420109009
Step-7 : Start debugger for verification of program logic
Debugging of program starts with clicking on the start debug session step
by step. itcan be stop bye same button.
After click on the start debug button, debugger window look like as shown below.

MPMC 180420109009
ASSEMBLER DIRECTIVES
EQU directive
− The EQU directive is used to replace a number by a symbol.
− Syntax:Name EQU Constant
− For example:
MAXIMUM EQU 99 After using this directive, every appearance of the label
“MAXIMUM” inthe program will be interpreted by the assembler as the
number 99 (MAXIMUM = 99). Symbols may be defined this way only once
in the program. The EQU directive is mostly used at the beginning of the
program therefore.
SET directive
− The SET directive is also used to replace a number by a symbol. The
significant difference compared to the EQU directive is that the SET
directive can be used an unlimited number oftimes:
− SPEED SET 45SPEED SET 46SPEED SET 57
BIT directive
− The BIT directive is used to replace a bit address by a symbol. The bit
address must be in therange of 0 to 255 (00 H to FF H).
− Syntax: Name BIT 8051 bit
− For example:
TRANSMIT BIT PSW.7; Transmit bit (the seventh bit in PSW register); is
assigned the name “TRANSMIT”OUTPUT BIT 6 ;Bit at address 06 is assigned
the name “OUTPUT”RELAY BIT81 ;Bit at address 81 (Port 0)is assigned the
name ;”RELAY”
CODE directive
− The CODE directive is used to assign a symbol to a program memory
address. Since the maximum capacity of program memory is 64K, the
address must be in the range of 0 to65535(0000 H to FFFF H).
− Syntax: Name CODE code address
− For example:
RESET CODE 0 ;Memory location 00h called “RESET”TABLE CODE
1024;Memorylocation 1024h called “TABLE”

MPMC 180420109009
DATA directive
− The DATA directive is used to assign a symbol to an address within internal
RAM and SFR. The address must be in the range of 0 to 255 (00 H to FF H).
It is possible to change or assign anew name to any register.
− Syntax: Name DATA data address
− For example:
TEMP12 DATA 32 ;Register at address 32 is named ;as “TEMP12”STATUS_R
DATA D0h ;PSW register is assigned the name ;”STATUS_R”
IDATA directive
− The IDATA directive is used to change or assign a new name to an
indirectly addressedregister. It is an address of entire internal RAM.
− Syntax: Name IDATA idata address
− For example:
TEMP22 IDATA 32 ;Register whose address is in register ;at address
32 is named as “TEMP22”TEMP33 IDATA T_ADR ;Register whose
address is in ;register T_ADR is named as “TEMP33”
XDATA directive
− The XDATA directive is used to assign a name to registers within external
(additional) RAMmemory. The addresses of these registers cannot be
larger than 65535 (0000 h to FFFF H).
− Syntax: Name XDATA xdata address
− For example:
TABLE_1 XDATA 2048 ;Register stored in external; memory at address
2048 is named; as“TABLE_1”
ORG directive: Origin
− The ORG directive is used to specify a location in program memory
where the programfollowing directive is to be placed.
− Syntax: ORG address
− Address can be given in either in hex or decimal.
− For example:
BEGINNING ORG 100 ... ...ORG 1000hTABLE .......... This program starts
at location 100. The table containing data is to be stored at location 1024 (1000h).

MPMC 180420109009
USING directive
− The USING directive is used to define which register bank (registers R0-R7)
is to be used in theprogram.
− Syntax: USING Bank no.
− USING 0 ;Bank 0 is used (registers R0-R7 at RAM-addresses 0-7)USING 1
;Bank 1 is used (registers R0-R7 at RAM-addresses 8-15)USING 2 ,Bank 2
is used (registers R0-R7 at RAM-addresses 16-23)USING 3 ;Bank 3 is used
(registers R0-R7 at RAM-addresses 24-31)
END directive: End of program
− The END directive is used at the end of every program. The assembler will
stop compilingoncethe program encounters this directive.
− Syntax: END
− For example:
END ;End of program
DB directive
− The DB directive is used for writing specified value into program memory. If
several values are specified, then they are separated by a comma. If ASCII
array is specified, it should be enclosedwithin single quotation marks.
− For example: CSEG DB 22,33,’Alarm’,44 If this directive is preceded by a
label, then the labelwill point to the first element of the array. It is the number
22 in this example.

kactieal -3
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ts NO
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YES
End

RHe An Bo51 pnaam to aanse o sel en 8bik
OunobeK gtoxeo inlenal_RAM 20 H to intemal
RAM
CSEG AT OC00H
MOV RO, F30H ninialfze 0urco poiote to SouneD dorta
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MOV R 0H iaithalize denstoahin painte iomal
RAM at 0 H
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b y
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poinHed denshinoton poioHe
INC Ro
INC R
DINZ Ra, Chec Cauole 0elgeump h
focreroeaot Souepointe
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HERE STMP HERE
END
Result
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tave t
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NO
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YES
End

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dota aNalable exkmal RAM mm ooo)H
Stouhing
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MOV DPTR,E100OH iaitialize 90ur painiet hspuree
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MOV K,E 40H inithtaize deshnohon Pointe n Soum
data io iotema RAM c uOH
MOV Ra, 10 1oihalze counter 10
MoVX A,DPTR Get data.Jro extexnalL RAM
paotedDuSougCo pointer
MONCOR, A Stooe data in tenal RAn1
Doioteo by desinotion Pointek
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ump
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Memcr 05
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Date
PageNo.
3. CONite Assembu level lanquaqepDgaam do oan.ser
Staadiog m
en- 9 bik data alailab le.
C10002H
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iotema RAMoDm CAo H
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MOV DPTR,# 1oooHinhalize Souar paioteg
MOV Ri HoH inialize destioahion poioteg
MoN R3, 600 initialize CowoHer 10
Li CLR A cea A bepre etarhoa oew
MovC. A,@A+DPIR Get dato om Saurce poio-esc n
CCCuoulat
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1NC DPTR
INC R1
10co emen SouC Doioler_
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DTNZ R3,L1 ehek Couoea 0 else ump hb_
LL
HERE 6JMP HERE
ND
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Cox1000 03 22 33 4t 5566 17 88 99a
olp
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D:ox4o 03 22 33 44 55 6614 8 99
A Quality Product by
unges
Your Lucky Brand Teacher'sSignature

Date
PageNo.
CWuite aggembly leveL anguage poDganm Bo5L poncessox
leveL
acnske 3-hi data Qvhilablo- inte2rpal RA atatinqoDm
0 H11 39H n S ame loCatino but in i0Veaseaeyerse code
AT 0000H
MOV R0, E 30H fnitialize 90utce poio1e
MOV RL#39H inihio ize desto
oahoopoioer
MOV R3 inihai z COuote =5
L MOV A,RO latching data m.m Souere p0iner dn alcumulator
KCH A,R4 inerehongiog doto cSauaca uith desho ahon
locohon ayailablo data
MOv ( RO , H oching desito hion locethon3 doa laila ble
in acuoulato Souc locahioo
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DEC R1
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do abLe L
HERE STMP HERE Oait
END
KesuH2
D:OK30 O4 22 33 u s5 66 99
olp
:0K 30 79 6G 5S G 33 22
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Teacher's Signature

Date
PageNo.
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END
Kesult
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r

•
Date : I
Page No. :
Roo • 6e1ec.k is~~ book' - 1
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Ro A •
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Teacher's Signature__________

Date
dachicaL -6 Page No. :
6.1 Aim Wxite assemhly lanquag.e pongam fo incneme
a COuoHe Sutrh aod s poesseol
deCoeMeot a Couoe i Soitch 32 3 poessCol
CukpukEthe Coun tex Value a POE1
CODE
CSEG AT O000H
MOV R3,HOoH
Mov P2,# OFF H Coaquze
ioitiade Couptea
povt2Os p
REP
J3 P2.2, LL ump SL s 0ot _pvessedd
NC R3
PLR3 display 0n 0nt
Mov
LLJB P2.1,L2 np S2 is ot paessed
DEC R3
Mov P1, R3 dspo 00po
L2 STMP REP
END
AQualiltyProductby
Ginger
Your Lucky Brand Teacher's Signature

Stort
inithaG2e COune =
Cookguoe P2 = 1 pr S2
P2.2 r SL 0s p Pios
YES incoearoent
Coun ter
PTesse d
NO
YES Decse ment
82 1s
COun ter
Presse
NO
isplay the Count on Pot-

Date
PageNo.
Kesut
p Pont2
P2 OXFB VVVVV V V
bifs
RosioxFB
agt 3 yules i/p
bi
Poat V _ V
PL OA03
PiosOK03
bits O
Poat2
P2 0xFO V
RosOxFO ,
bits O
Pan
PL0K02 V
Pns Ko2
AQuelily Productby
Ginges Teacher's Signature.
Your Lucky Brand

Date
Page No. :
6.2 Alm COxte an assemblylangtiag.e 0DQAam
&
display95 H_i Switc h S1 s pesseo
display
displayOAA H
EShowlo be clisploel On Paxt-1
SOite h S2 S 00esseol
CODE
CSEG AT 0000 H
MOV P2,FOFFH Conhauxe paut90s inpu
REP
JB P2.1 LL ump S1 snot Poesse
Moy P 55H displa
55
55H in olp Pot-1
Li JB P2.2 Aump i 2 hs not pressed
MOV PL, OAAH lo disploy oAA H a_auhout
Poat-
L9 sTMP REP
END
A Quality Product by
Gnger

Stoat
Co0gube. P2.1 os SI Onod
toA P2.2 hvr S2 os ilP Piog
yES
disploy 55H
S1 is
at Poot1
Pres3 ed
NO
displayAAH
ex Pout-1/
S2 is YES
Poessed

Date
Page No.
Kesutt
2tp
Poat-2 ,bits bits. 0
P2: oxFD VVVVVV V
RosoKFD V/ / S .
elp
Poxt- 11 bts
PL 0K35
,. .
Pios 55
Poat- 9 bits
P2 Ox FB
PosoxFB V
Poo 1L bit S
PLOx
AA V. v,
Hos O AOAA VV, Vv
AQUalityProductby
Gngers Teacher's Signature
Your Lucky Brand

Date
PageNo.
oac-hicaL -
1Aim Wmte assemblypoDgaanm that genexaies gae pulge
0 KHZ aequeocuLh50 L Duty o4cle oo
Pi.o pio o 3051uSing hmer o mado.1
Hssume osellatox se . 0592 MHz,
eCoDE
SQW EQU PL.0
CSEG AT O000 H
CLR SW S0w = O
MOV TMOD,#OI 3 Cookjguxe himeo-o io mode -L
MON TLO,33 lood inihial_cauc
MOV THO EEH Shghes bts o nitial cost
SETB TRO Stoat timer
tOAITTBC TFO,NEXT cheak o imer oveou
TMP WALIT
NEXT MOV TLO,t33HSReloadioial Count
MOV THo,#E OFEH
CPL SQW (onplero ent p1.o bik
STMP cOAIT
END
'hesut
(uasor-1 25.45192 Sec
Cussoo 2 25. 4S 293 Secel
lioe peiee 1 oee
Cinge 1KH2 uene Teacher'sSignature

(Stost
Cleav Poot-1 bit o
ConBgu ime - 0 in modle L
oihal Coun o TLO THO /
Stas hme O
No
TFO 1
YES
Kelo ao oithaL C0unb+0 TOdTHo
tog9 le bit Plo

MPMC Practical-7.1 180420109009
OUTPUT AT LOGIC ANALYZER

Date
Page No.
T.2 A Wefe_gssembly a09aam fhat qenera-tee gake pulse6 0
KHz equeo.cu oth50 Duty Cyale oo PL0pio
B051 uSing limer 0 mado- 2
Asume 0ellator e l05 12 MKz
CODE
SQW EQU Pi.0
CSEG AT O000 H
CLR
MOV MOD 02 3 Coogqupe dimea o io mode-2
Mov TLO# LAH l0ad 8-bit 10HaL couot
MOV THO, LAH
MOV R3,#O0 User couoter
SE T3TRO Stast oe&
COAIT TBC TFO, NEXT check or mea oveou
STMP WAIT
NEXT 2 INC R3 í9Cvemeob C0uoter
Uses
CINE R3,#02 WAIT CheuK os hwp fones Oveou
MOy K3, E O0H Heset Ounteg
CPL SQD
SIMpALT
10ggle the pulse
END
Quality Productby
Ginger
Your Lucky EBrand Teacher's Signature

(Staat
Clea Poat bit-o
Coo 9ube timer O io mode -2
nih'hze ovelow co unter = o
Looo hha L Count h TIO d THol
tos himer O
/
NO
TFO =iy
yES
incoement oveow Cuntex
COunlea = 2
yES
Reset Couokr to o
go99 99 le he Pot bib PL.o

Date
PageNo.
Kesult 2
LuasoxL 13.13363 Sec
Cunsor 2 13.13463 Sec
Clime pemoc LCuoLe
O. O| Sec
LmSe c
1KHz eguen.Cu
AQualityProductby
gen
Your LuckyBrand Teacher's Signature.

MPMC Practical-7.2 180420109009
OUTPUT AT LOGIC ANALYZER

Date
Page No.
13 Aim Wole asSembly2o09aam tha updaies and displat
tme Secono Oo Pot0 8051 Usino
Himed O20 m0de L
Assuma 0SCillatx
e .012 MHZ
CoDE
TOLSB EQD OFDH
TOMSB EQO BH
CSFG AT OOO0H_
R3, oH Counes=00
MOV R o0H
MOV
Sec O0
MOV P0, Ry
MOV TMOD E0LH 3 Coobue
3dispo3 0n Post-o
imeo 0ode -
MOV TLD, FTOLSB load tial COuo
MOV THO, TOMS3
SETB TRO Stax iroer
OAIT TBC TFO , NEXTcheok ro Oveo
ST MP C0AIT
NET MOV TLO,#TO19B Reloao Lbtial Cos
MOv THo ToSB
INC R3 ocaemeot bsey couoten
CTNE R3, H20,wAIT chec r 1ee
MOV R3 #00H 2 Aese COuoer to oo
Mov A, Ku
AQualyProductby
Ginger
Your Lucky Brand
Teacher'sSignature

onepe Stoot
User COunte k3 0
9etond. ountear Ru = O
ioihalize
initial/2ee
CooBgue imer o in mode-l
ood inihal couo TLO THO
ChecK fur fimoe oveolow
taatimer -O
NO
YES
TFO== 1
TFO O
7eload himer oun kr
n cotm ent counwr Rs
NO
R3 20
YES
make counter o d odd 1 to gnd
NO
>
dsploy Second
second = bo
00 Post- o
YES
rmolke Second coun ter Ru = 0

Date
Page No. :
ADD A, #o1 H upda te Sec idecimol
DA A decimaladjus
CTNE A # 60H, SKIP cheuk or 60 Sec
MOV A, OoH Reset sec Ount
SKIP MOV Ru, A_
MOy Po, R4_ displou Sec
BTMP 0 AT
END
Kestl
Poat 0 4 bits -
Po Ox59
Kos0KOo
Post-O bis
PO OKIOD
aller 5 Sec's
Caorn
Set nd lock_
9taafe m Seconol
AQuality Productb
inger

SEVEN SEGMENT
DISPLAY
Submitted To :
1. Dr. Nilesh Shah
April, 2021

MPMC 180420109009
PRACTICAL – 8.1
AIM : Draw an Interfacing scheme to interface four common cathode seven-segment
LEDs with 8051 and using this interfacing scheme write an embedded 'C' program to
display passing year.
CODE :
#include<reg51.h>
#define t0lsb 0x00
#define t0msb 0xEE
bit bdata displayflg = 0;
sbit SEL0 = P2^5;
sbit SEL1 = P2^6;
sbit SEL2 = P2^7;
sbit LE = P3^7;
unsigned char dispdata[4] = {2,0,2,1};
unsigned char code seven_seg[10] = {0x3f,0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07,0x7f,0x6f};
void t0isr (void);
void display (void);
unsigned char disppos=0;
void main(void)
{
P0 = 0;
SEL0 = 0;
SEL1 = 0;
SEL2 = 0;
LE=1;
TMOD = 0x01;
TL0 = t0lsb;
TH0 = t0msb;
ET0 = 1;
TR0 = 1;
EA = 1;
while(1)
{
if (displayflg==1)
{
displayflg = 0;
display();
}

MPMC 180420109009
}
}
void t0isr (void) interrupt 1
{
TL0 = t0lsb;
TH0 = t0msb;
displayflg = 1;
return;
}
void display (void)
{
switch(disppos)
{
case 0:
SEL0 = 0;
SEL1 = 0;
break;
case 1:
SEL0 = 1;
SEL1 = 0;
break;
case 2:
SEL0 = 0;
SEL1 = 1;
break;
case 3:
SEL0 = 1;
SEL1 = 1;
break;
}
P0 = seven_seg[dispdata[disppos]];
disppos++;
if (disppos==4)
disppos=0;
}
OUTPUT :

MPMC 180420109009
PRACTICAL – 8.2
AIM : Write an embedded 'C' program that updates and displays real-time second
and minute on 4-digit common cathode seven segment display
CODE :
#include<reg51.h>
#define t0lsb 0x00
#define t0msb 0xEE
bit bdata displayflg = 0;
sbit SEL0 = P2^5;
sbit SEL1 = P2^6;
sbit SEL2 = P2^7;
sbit LE = P3^7;
unsigned char dispdata[4] = {2,0,2,1};
unsigned char code seven_seg[10] = {0x3f,0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07,0x7f,0x6f};
void t0isr (void);
void display (void);
void rtc (void);
unsigned char disppos=0, cnt = 0;
unsigned char sec = 0, min = 0;
void main(void)
{
P0 = 0;
SEL0 = 0;
SEL1 = 0;
SEL2 = 0;
LE = 0;
TMOD = 0x01;
TL0 = t0lsb;
TH0 = t0msb;
ET0 = 1;
TR0 = 1;
EA = 1;
while(1)
{
if (displayflg==1)
{
displayflg = 0;

MPMC 180420109009
display();
}
}
}
void t0isr (void) interrupt 1
{
TL0 = t0lsb;
TH0 = t0msb;
displayflg = 1;
return;
}
void display (void)
{
switch(disppos)
{
case 0:
SEL0 = 0;
SEL1 = 0;
break;
case 1:
SEL0 = 1;
SEL1 = 0;
break;
case 2:
SEL0 = 0;
SEL1 = 1;
break;
case 3:
SEL0 = 1;
SEL1 = 1;
break;
}
P0 = seven_seg[dispdata[disppos]];
disppos++;
if (disppos==4)
disppos=0;
}
void rtc (void)
{
sec++;

MPMC 180420109009
if(sec == 60)
{
sec = 0;
min++;
if (min == 60)
{
min = 0;
}
dispdata[0] = min/10;
dispdata[1] = min%10;
}
dispdata[2] = sec/10;
dispdata[3] = sec%10;
return;
}
OUTPUT :

INTERFACING 20*2
LCD DISPLAY
Submitted To :
1. Dr. Nilesh Shah
April, 2021

MPMC 180420109009
PRACTICAL – 9.1
AIM : Draw an Interfacing scheme to interface 20x2 LCD display with 8051. Write an
embedded 'c' program that displays "--Welcome To--" in line-1 and "--SCET, SURAT--
" in line-2 of LCD display.
CODE :
#include<reg51.h>
sbit RS = P2^7;
sbit RWB = P2^6;
sbit EN = P2^5;
sbit BUSY = P0^7;
unsigned char msg1[14] = {"--Welcome To--"};
unsigned char msg2[15] = {"--SCET, SURAT--"};
void lcd_cmd (unsigned char);
void lcd_data (unsigned char);
void ready(void);
void lcd_initialize(void);
unsigned char i, j, value;
void main (void)
{
P2 = 0;
EN = 0;
P0 = 0;
lcd_initialize();
lcd_cmd(0x80); // set DDRAM address for line-1
for (i=0; i<=13; i++)
{
lcd_data(msg1[i]);
}
lcd_cmd(0xc0); // set DDRAM address for line-2
for(i=0; i<=14; i++)
{
lcd_data(msg2[i]);
}
while(1);
}

MPMC 180420109009
void lcd_cmd(unsigned char value)
{
ready();
RS = 0; // select command register
RWB = 0; // write command to lcd
P0 = value;
EN = 1; // latch command
EN = 0;
return;
}
void lcd_data(unsigned char value)
{
ready();
P0 = value;
EN = 0;
return;
}
void ready (void)
{
BUSY = 1; // Configure P0.7 as i/p point
RWB = 1; // read command from lcd
EN = 0;
while(BUSY ==1)
{
EN = 0;
EN = 1;
}
EN = 0;
}
void lcd_initialize(void)
{
lcd_cmd(0x3c); // 8bit/char, 2-line, 5*10
lcd_cmd(0x06); // right entry mode
lcd_cmd(0x0E); // display on, cursor on, non
blinking cursor
lcd_cmd(0x01); // clear lcd, home cursor
return;
}

MPMC 180420109009
OUTPUT :
--Welcome To--
--SCET, SURAT--
PRACTICAL – 9.2
AIM : Write an embedded ‘c’ program that updates and displays Real-Time Clock
data on LCD.
CODE :
#include<reg51.h>
#define lsb 0xb0
#define msb 0x3c
sbit RS = P2^7;
sbit RWB = P2^6;
sbit EN = P2^5;
sbit BUSY = P0^7;
unsigned char msg1[16] = {"--DigitalClock--"};
unsigned char disp_data[8] = 0;
void lcd_cmd (unsigned char);
void lcd_data (unsigned char);
void ready(void);
void lcd_initialize(void);
void display_clock(void);
void rtc(void);
void t0isr(void);
bit bdata secfig = 0;
unsigned char i, j, cnt = 0, sec = 0, min = 0, hr = 0;
void main (void)
{
EN = 0;
TMOD = 0x01; // configure timer-0 in timer mode-1
TL0 = lsb; // load count for 50 ms overflow time
TH0 = msb;

MPMC 180420109009
ET0 = 1; // enable timer-0 overflow inturrept
lcd_initialize();
lcd_cmd(0x80); // set DDRAM address for line-1
for(i=0; i<16, i++)
{
lcd_data(msg1[i]);
}
lcd_cmd(0xc0); // set DDRAM address for line-2
for(i=0; i<16; i++)
{
if(i == 2 | i == 5)
lcd_data(':');
else
lcd_data(disp_data[i]+'0');
}
TR0 = 1; // start timer-0
EA = 1; // enable 8051 inturrept system
while(1)
{
if(secflg == 1)
{
secflg = 0;
rtc();
}
} // end of while
} // end of main
void t0isr(void) interrupt 1
{
TL0 = lsb; // reload timer count
TH0 = msb;
cnt++;
if(cnt == 20) // check for 1 sec
{
cnt = 0;
secfig = 1;
}
return;
}
void diplay_clock(void)
{
lcd_cmd (0xc0);
for(i=0; i<8; i++)
{
if( i == 2 | i == 5)

MPMC 180420109009
lcd_data(':');
else
lcd_data(disp_data[i]+'0');
}
return;
}
void rtc(void)
{
sec++;
if (sec==60)
{
min = 0;
min++;
if(min == 60)
{
min = 0;
hr++;
if(hr == 24)
hr = 0;
disp_data[0] = hr/10;
disp_data[1] = hr%10;
}
disp_data[3] = min/10;
disp_data[4] = min%10;
}
disp_data[6] = sec/10;
disp_data[7] = sec%10;
display_clock();
}
void lcd_cmd(unsigned char j)
{
ready();
P0 = j;
EN = 0;
return;
}
void lcd_data(unsigned char value)
{
ready();
P0 = j;
EN = 0;

MPMC 180420109009
return;
}
void ready (void)
{
BUSY = 1; // Configure P0.7 as i/p point
RWB = 1; // read command from lcd
EN = 0;
while(BUSY ==1)
{
EN = 0;
EN = 1;
}
EN = 0;
}
void lcd_initialize(void)
{
lcd_cmd(0x3c); // 8bit/char, 2-line, 5*10
lcd_cmd(0x06); // right entry mode
lcd_cmd(0x0E); // display on, cursor on, non blinking
cursor
lcd_cmd(0x01); // clear lcd, home cursor
return;
}

SERIAL
COMMUNICATION
Submitted To :
1. Dr. Nilesh Shah
April, 2021

MPMC 180420109009
PRACTICAL – 10.1
AIM : Write an embedded C program code to Transmit ‘A’ Serially continuously
CODE :
#include<reg51.h>
// fclk = 11.0592 MHz and 12 clocks per cycle
#define baud_9600 253
/* fclk = 11.0592 MHz and 6 clocks per cycle
fclk = 18.432 MHz and 12 clocks per cycle
*/
void main(void)
{
unsigned char i
SCON = 0x40; // serial mode 1 - 8bit variable baudrate
TMOD = 0x20; // timer 1 in mode 2
TH1 = baud_9600;
TL1 = baud_9600;
TR1 = 1;
for(i=0; i<10; i++)
{
SBUF = 'A';
while(TI == 0); // wait till transmission is completed
TI = 0;
}
}

MPMC 180420109009
PRACTICAL – 10.2
AIM : Write an embedded C program code to Receive Serially continuously.
CODE :
#include<reg51.h>
*/
void main(void)
{
TH1 = baud_9600;
TL1 = baud_9600;
TR1 = 1;
REN = 1; // enable recieve
while(1)
{
while(RI == 0); // wait till transmission is completed
RI = 0;
P1 = SBUF;
}
}

MPMC 180420109009
PRACITCAL – 10.3
AIM : Write an embedded C program code to Transmit and Receive Serially
continuously.
CODE :
#include<reg51.h>
*/
unsigned char i = 0;
unsigned char msg[100];
unsigned char count = 0;
void main(void)
{
TH1 = baud_9600;
TL1 = baud_9600;
TR1 = 1;
REN = 1; // enable recieve
ES = 1;
EA = 1;
while(1);
}
void serial_isr(void) interrupt 4
{
if(T1 == 1)
{
T1 = 0;
SBUF = msg[1]-0x20;
i++;
if(i>count)
TR1 = 0;
}

MPMC 180420109009
if(RI = 1)
{
RI = 0;
if(SBUF != '$')
{
msg[i] = SBUF;
i++;
count++;
}
else
{
i = 0;
SBUF = msg[i]-0x20;
i++;
}
}
}

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