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Lab Work 3 : Simulating Output Port
At the end of this lab session, students will:1. Configure I/O
ports according to the circuit diagram.2. Use subroutine in writing
program.3. Write and simulate the program according to the problem
given.
4. Download and test the program on the Proteus
Equipment l ist:1. Personal computer (PC)2. MPLAB software3.
Proteus software
TheoryOne of the most important feature of the microcontroller
is a number of input/output pins usedfor connection with
peripherals. In this case, there are in total of thirty-five
general purpose I/Opins available, which is quite enough for the
most applications.In order pins operation can match internal 8-bit
organization, all of them are, similar to registers,
grouped into five so called ports denoted by A, B, C, D and E.
They all have several features incommon:For practical reasons, many
I/O pins have two or three functions. If a pin is used as any
otherfunction, it may not be used as a general purpose input/output
pin; andEvery port has its satellite, i.e. the corresponding TRIS
register: TRISA, TRISB, TRISC etc.which determines performance, but
not the contents of the port bits.By clearing some bit of the TRIS
register (bit=0), the corresponding port pin is configured
asoutput. Similarly, by setting some bit of the TRIS register
(bit=1), the corresponding port pin isconfigured as input. This
rule is easy to remember 0 = Output, 1 = Input
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Precedure:
1. Create a New Project File with following setting:Device:
PIC18F4550
Active Toolsuite: Microchip MPASM ToolsuiteProject Name Lab3
Project Directory
2. Open a new file by clicking File> New, and key in the
program below. After a few linessave as this program as
Lab3.asm
#include
D1 EQU 0x20D2 EQU 0x21D3 EQU 0x22
ORG 00H
MOVLW 00HMOVWF TRISD
LOOP:MOVLW B'00000001'MOVWF PORTDCALL DELAYMOVLW
B'00000000'MOVWF PORTDCALL DELAYGOTO LOOP
DELAY:MOVLW D'3'MOVWF D3MOVLW D'2'MOVWF D2MOVLW D'1'MOVWF
D1DECFSZ D1GOTO $-1DECFSZ D2GOTO $-5
DECFSZ D3GOTO $-9RETURN
END
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3. Continue entering the code. When complete, go to the Project
menu again, click AddFiles to Project... and select the one you
have just saved.
4. Assembler the program by pressing Project>Build All.(If
the error occurs, fix it and repeat step 4 again.)
Simulating the program using Proteus
1. Simulate your program with Proteus
2. GoStart Proteus 7 Professional click ISIS 7
Profesional.
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3. Simulate your program to the schematic shown below
Activi ty 1
Write and assemble a program to toggle all the bits of PORTD
continuously by sending55H and AAH to these ports. Put a time delay
between the "on" and "off" states.
Discussion 1Write the code for activity 1
Activi ty 2Write and assemble a program to make LEDs work as a
running light.Question and Discussion
2. Discussion3. Conclusion
RA0/AN02
RA1/AN13
RA2/AN2/VREF-/CVREF4
RA3/AN3/VREF+5
RA4/T0CKI/C1OUT/RCV6
RA5/AN4/SS/LVDIN/C2OUT7
RA6/OSC2/CLKO14
OSC1/CLKI13
RB0/AN12/INT0/FLT0/SDI/SDA33
RB1/AN10/INT1/SCK/SCL
34
RB2/AN8/INT2/VMO35
RB3/AN9/CCP2/VPO36
RB4/AN11/KBI0/CSSPP37
RB5/KBI1/PGM38
RB6/KBI2/PGC39
RB7/KBI3/PGD40
RC0/T1OSO/T1CKI15
RC1/T1OSI/CCP2/UOE16
RC2/CCP1/P1A17
VUSB18
RC4/D-/VM23
RC5/D+/VP24
RC6/TX/CK25
RC7/RX/DT/SDO 26
RD0/SPP019
RD1/SPP120
RD2/SPP221
RD3/SPP3 22
RD4/SPP427
RD5/SPP5/P1B28
RD6/SPP6/P1C29
RD7/SPP7/P1D30
RE0/AN5/CK1SPP8
RE1/AN6/CK2SPP9
RE2/AN7/OESPP10
RE3/MCLR/VPP1
U1
PIC18F4550R110k
R2220
D1LED
R3220
D2LED
R4220
D3LED
R5220
D4LED
R6220
D5LED
R7220
D6LED
R8220
D7LED
R9220
D8LED
