This document provides an overview and agenda for interfacing with the PIC16F877A microcontroller. It discusses the microcontroller's pins and ports, including PORTA-PORTE. It describes the minimum hardware needed and some example input and output devices like LEDs, buttons, and sensors. It then outlines 4 projects involving flashing LEDs, toggling an LED with a button press, and turning on a 220V lamp with a button. The document provides information on timers, analog to digital conversion, communication protocols, and other features of the PIC16F877A.

1. Interfacing I

2. Agenda
• ‘PIC16F877A’ Overview
• ‘PIC16F877A’ Pins & Ports
• Minimum Hardware
• Input & Output Devices
• Project 1 “Flasher-1”
• Project 2 “Flasher-2”
• Pull-Up & Pull-Down Resistor
• Project 3 “Button-1”
• Project 4 “High-Volt”

3. ‘PIC16F877A Overview
• Operating Speed : 20 MHz clock input
• 3 Timers ( 1 * 16 bit --- 2 * 8 bit)
• 2 CCP Modules
• 8- channel , 10-Bit Analog to digital Converter (ADC)
• Synchronous Serial Port ( SPI & I2C)
• Universal Synchronous Asynchronous
Receiver/Transmitter (USART)
• 100,000 Erase/Write cycle Enhanced Flash
• 1000,000 Erase/Write cycle EEPROM
• In-Circuit Serial Programmer (ICSP)

4. ‘PIC16F877A’ Pins & Ports

5. ‘PIC16F877A Ports : PORTA
• RA0 , RA1 : Digital I/O , Analog input
• RA2 : Digital I/O , Analog input , ADC Ref- , Comparator Ref
• RA3 : Digital I/O , Analog input , ADC Ref+
• RA4 : Digital I/O , Comparator 1 output
• RA5 : Digital I/O , Analog input , SPI salve select , Comparator 2 output
PORTA : is a 6-Bit Bidirectional port

6. ‘PIC16F877A Ports : PORTB
• RB0 : Digital I/O , External Interrupt
• RB1 : Digital I/O
• RB2 : Digital I/O
• RB3 : Digital I/O , Low voltage ICSP programming enable pin
• RB4 : Digital I/O
• RB5 : Digital I/O
• RB6 : Digital I/O , In circuit Debugger & ICSP Programming Clock
• RB7 : Digital I/O , In circuit Debugger & ICSP Programming Data
PORTB : is an 8-Bit Bidirectional port , with software weak PULL-UP

7. ‘PIC16F877A Ports : PORTC
• RC0 : Digital I/O , TMR1 Oscillator output , TMR1 external clock input
• RC1 : Digital I/O , TMR1 Oscillator input , Capture2 input , compare2 , PWM2
• RC2 : Digital I/O , Capture 1 input , Comparator 1 output , PWM 1 output
• RC3 : Digital I/O , SPI clock , I2C clock
• RC4 : Digital I/O , SPI data in , I2C data I/O
• RC5 : Digital I/O , SPI data out
• RC6 : Digital I/O , UART transmitter , USART clock
• RC7 : Digital I/O , UART receiver , USART Data
PORTC : is an 8-Bit Bidirectional port

8. ‘PIC16F877A Ports : PORTD
• RD0 : Digital I/O , Parallel Slave port bit 0
• RD1 : Digital I/O , Parallel Slave port bit 1
• RD2 : Digital I/O , Parallel Slave port bit 2
• RD3 : Digital I/O , Parallel Slave port bit 3
• RD4 : Digital I/O , Parallel Slave port bit 4
• RD5 : Digital I/O , Parallel Slave port bit 5
• RD6 : Digital I/O , Parallel Slave port bit 6
• RD7 : Digital I/O , Parallel Slave port bit 7
PORTD : is an 8-Bit Bidirectional port

9. ‘PIC16F877A Ports : PORTE
• RE0 : Digital I/O , Analog input , Read control for parallel slave
• RE1 : Digital I/O , Analog input , Write control for parallel slave
• RE2 : Digital I/O , Analog input , chip select control for parallel slave
PORTE : is a 3-Bit Bidirectional port

10. Minimum Hardware

11. Input & Output Devices
Output Devices :
- LEDs
- Buzzer
- 7-Segment
- LCDs
Input Devices :
- Buttons & Switches
- Sensors

12. Project-1 “Flasher-1”
Make project where a LED is connected to RB0 , This LED is on for
half Second and off for another half second .

13. Project-2 “Flasher-1”
Make project where an 8 LED is connected To PORTB , half LED is on
for 0.5s and the other is off and After 0.5s the LED is complemented

14. Pull-Up & Pull-Down Resistor

15. Project-3 “Button-1”
LED is connected to RB0 and button to RD0 When the button is pressed the
LED complement Its Status

16. Project-4 “High-Volt”
220-Lamp is connected to RB0 and button to RD0 When the button is pressed
the Lamp is on for 1s then off.

17. Q & A