MICROCONTROLLERS Why a microcontroller is needed?

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Introduction to PIC Microcontrollers

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Presentation transcript:

MICROCONTROLLERS Why a microcontroller is needed? Variety of microcontrollers Why PIC microcontrollers? Specificiations of PIC 16F877 Programming PIC 16F877 PIC 16F877 in circuit Some applications(led,button,lcd,ADC,PWM) Links

Why a microcontroller is needed? Sensors Microcontrollers Actuators

Variety of microcontrollers Atmel – AT90S8535 Motorola – 68HC11 Intel - 8051 Texas Instruments - Microchip – PIC16F84, PIC16F877

Why PIC microcontrollers? Easy to program Better online documantation

PIC 16F877

PIC 16F877 8 kbytes of FLASH Program Memory 368 bytes of Data Memory (RAM) 256 bytes of EEPROM Data Memory 33 input or output pins 20 MHz operating speed(200 ns instruction cycle) Max. 25 mA current from an output pin

Programming PIC 16F877 Assembler (MPLAB) Basic (Pic Basic Pro) C (HITEC PICC) Parallel port Serial port

Minimum circuitry for PIC16F877

LED (light emitting diode) flasher LOOP: HIGH PORTB.0 PAUSE 500 LOW PORTB.O GOTO LOOP

BUTTON INPUT PORTD.2 LOOP: IF PORTD.2=1 THEN HIGH PORTB.O ELSE LOW PORTB.0 ENDIF GOTO LOOP

LCD DEFINE OSC 4 DEFINE LCD_DREG PORTB DEFINE LCD_DBIT 4 DEFINE LCD_RSREG PORTB DEFINE LCD_RSBIT 0 DEFINE LCD_EREG PORTB DEFINE LCD_EBIT 1 DEFINE LCD_BITS 4 DEFINE LCD_LINES 2 DEFINE LCD_COMMANDUS 2000 DEFINE LCD_DATAUS 50 LCDOUT 254,1, "MERHABA" LCDOUT 254,192,"2x16 LCD" END

Analog to Digital Conversion Format: ADCIN Channel,Var Sample Program: ABC VAR BYTE ADCON1 = 2 ' PORTA is analog INPUT PORTA.0 LOOP: ADCIN PORTA.0,ABC LCDOUT 254,1,#ABC PAUSE 100 GOTO LOOP

Pulse Width Modulation Format: HPWM Channel,Dutycycle,Frequency Sample Program: DEFINE CCP1_REG PORTC'Hpwm 1 pin port DEFINE CCP1_BIT 2 'Hpwm 1 pin bit HPWM 1,64,1000 ' Send a 25% duty cycle PWM signal at 1kHz END

Pulse Width Modulation DEFINE CCP1_REG PORTC 'Hpwm 1 pin port DEFINE CCP1_BIT 2 'Hpwm 1 pin bit DUTY VAR BYTE i VAR BYTE DONGU: FOR i=0 TO 255 HPWM 1,DUTY,1000 DUTY=DUTY+1 PAUSE 50 NEXT GOTO DONGU

Links www.microchip.com (Official website of the PIC manufacturer, PIC16F877 datasheet & some application notes are avaliable) www.antrak.org (Ankara amateur radio society website, biggest pic source in Turkish) www.eproje.com (Some applications are avaliable in Turkish) www.picproje.net (A discussion forum on PIC microcontrollers in Turkish) www.elektroda.pl (A discussion forum on PIC microcontrollers) robot.metu.edu.tr (METU Robot Society website, some tutorials and application notes will be avaliable)