Valdes Fernando - Microcontrollers Applications With Pic

Vi xử lý 2 -Nguyễn Đình Phú (PIC 16F877A)

Advanced PIC Microcontroller Projects in C

15 Project ví dụ cơ bản lập trình PIC16F877A trong CCS

Giao trinh vdk PIC16F va ngon ngu lap trinh Hi-Tech C

Lập trình C bằng CCS cho PIC 16f877A

PIC16F877 programming

 MicroChip- PIC16F877

Introduction:-

This document contains device specific information. Additional information may be found in the PICmicro Mid-Range Reference Manual (DS33023), which may be obtained from your local Microchip Sales Representative or downloaded from the Microchip website. The Reference Manual should be considered a complementary document to this data sheet, and is highly recommended reading for a better understanding of the device architecture and operation of the peripheral modules.

Features of PIC16F877:-

• High performance RISC CPU

• Only 35 single word instructions to learn

• All single cycle instructions except for program branches which are two cycle

• Operating speed: DC - 20 MHz clock input

      DC - 200 ns instruction cycle

• Up to 8K x 14 words of FLASH Program Memory, Up to 368 x 8 bytes of Data Memory  

  Up to 256 x 8 bytes of EEPROM Data Memory

• Pinout compatible to the PIC16C73B/74B/76/77

• Interrupt capability (up to 14 sources)

• Eight level deep hardware stack

• Direct, indirect and relative addressing modes

• Power-on Reset (POR)

• Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)

• Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation

• Programmable code protection

• Power saving SLEEP mode

• Selectable oscillator options

• Low power, high speed CMOS FLASH/EEPROM technology

• Fully static design

• In-Circuit Serial Programming (ICSP) via two pins

• Single 5V In-Circuit Serial Programming capability

• In-Circuit Debugging via two pins

• Processor read/write access to program memory

• Wide operating voltage range: 2.0V to 5.5V

• High Sink/Source Current: 25 mA

• Commercial, Industrial and Extended temperature ranges

• Low-power consumption:

- < 0.6 mA typical @ 3V, 4 MHz

- 20 μA typical @ 3V, 32 kHz

- < 1 μA typical standby current

Peripheral Features:

• Timer0: 8-bit timer/counter with 8-bit prescaler

• Timer1: 16-bit timer/counter with prescaler, can be incremented during SLEEP via external 

   crystal/clock

• Timer2: 8-bit timer/counter with 8-bit period register, prescaler and postscaler

• Two Capture, Compare, PWM modules

- Capture is 16-bit, max. resolution is 12.5 ns

- Compare is 16-bit, max. resolution is 200 ns

- PWM max. resolution is 10-bit

• 10-bit multi-channel Analog-to-Digital converter

• Synchronous Serial Port (SSP) with SPI (Master mode) and I2C (Master/Slave)

• Universal Synchronous Asynchronous Receiver Transmitter (USART/SCI) with 9-bit address

Detection

                                   Analog to Digital Converter

// Analog to Digital converter

#include<htc.h>

unsigned int data1,data2;

void main(void)

            {

             PORTC=0x00;

            TRISC=0x00;

            PORTB=0x00;

            TRISC=0x00;

            ADIE=1;                     //enable AD conversion interrupt

            while(1)

            {

                        ADIF=0;         //make AD interrupt flag 0 initially

                        ADCON0=0x00;        //channel-0 fosc/2

                        ADCON1=0b10001111;//----select analog AN0 input

                        ADON=1;                   //---start AD

                        GODONE=1; //--start conversion

                        while(GODONE);      //--stay until conversion completed

                        if(ADIF==1)   //--AD overflow

                        {

                                    data1=ADRESH;       //storing higher byte in data1

                                    data2=ADRESL;        //storing lower byte in data2

                   }

            PORTB=data1;           //writing data1 onto port-b

            PORTC=data2;           //writing data2 onto port-c

            }

}

                                            Timer Programming

//1sec delay using timer-0 and blinking leds on port-b

#include<htc.h>

#define LEDS PORTB

void delay_us(void);

unsigned int i,j;

void main(void)

{

//          LEDS=0x00;

            TRISB=0x00;

            while(1)

            {

                        LEDS=0xFF;  //write 1111_1111 on portB

                        delay_us();      //---- calling delay

                        LEDS=0x7E;  //----- 0111_1110

                        delay_us();

                        LEDS=0x3C;  //----- 0011_1100

                        delay_us();

                        LEDS=0x18;   //----- 0001_1000

                        delay_us();

                        LEDS=0x3C;  //----- 0011_1100

                        delay_us();

                        LEDS=0x7E;  //----- 0111_1110
                    delay_us();     

           

      }

}

void delay_us()

{

            GIE=1;                        //global interrupt enable

            OPTION_REG=0b00011000;            //0,1,2 bits 1:2 prescalar ; 4 bit PSA prescalar   

                                                                      Timer=0;5 bit T0sE rising edge clk ;6 bi        

                                                                        //T0cs enables internal clk source

            T0IE=1;                       //enables timer-0 interrupt

            for(j=0;j<1000;j++)

            for(i=0;i<200;i++)

            {

                        TMR0=0x05;  //loading starting value of timer0

                        while(T0IF==0);         //wait until timer-0 overflow occur

                        T0IF=0;                       //clear after overflow

            }

}

                                                             USART_Rxn

// USART data receiving mode

#include<htc.h>

unsigned int data;

void main(void){

            SPBRG=0b00011111;            //31 setting baud rate 9600 for 20MHz

            TXSTA=0b00000100;            //setting highspeed baudrate

            PORTC=0x00;

            TRISC=0x00;             //set PORTB as output port

            RCIF=0;                                  //initially clear receive flag

            SPEN=1;                                 //serial port enable

            RCIE=1;                                 //receive interrupt enable

            PEIE=1;                                  //peripheral interrupt enable

while(1)

            {

            CREN=1;                                //start to receive

            while(RCIF==0);                    //stay until the receive buffer is full

            data=RCREG;

            PORTC=RCREG;                  //write the portC value as received value

            CREN=0;                                //clear cren

            RCIF=0;                                  //clear rcif

            }

}

                                                      USART_Txn

//USART trasmit mode

#include<htc.h>

unsigned char data[10]="EMBEDDED";

unsigned int i;

void main(void)

{

            GIE=1;                        //enable global internal

            PEIE=1;                      //enable peripheral interrupts

            SPBRG=0b00011111;            //31'D select baud rate 9600 for 20MHz

            BRGH=1;                   //selecting high baudrate

            SYNC=0;                    //Asynchronus transmission

            TXIE=1;                      //Transmit interrupt enable

            TXIF=0;                      //initially reset

while(1)

{

            for(i=0;i<10;i++)

            {

            TXEN=1;                    //Transmission enable

            TXREG=data[i];         //sending each char

            while(TXIF==1);        //wait until the bit is transmitted or untill the buffer clear

            TXEN=0;                    //disable transmission

            TXIF=0;                      //clear transmission flag

            }

      }

}

                                                EEPROM_READ_WRITE     

//EEPROM read/write operations

#include<htc.h>

void delay_1s(void);

unsigned int i,j;

#define LEDS PORTD

void main(void)

{         

            LEDS=0x00;

            TRISD=0x00;

            EEIE=1;

            RP1=0;            //bank-0

            RP0=0;

            for(i=0;i<20;i++)

            {

                        EEADR=i;      //load i as address

                        WREN=1;                   //write enable

                        EECON2=i+10;          //write data onto the eecon2 reg

                        EEDATA=EECON2; //write data onto the EEPROM          DATA reg

                        WR=1;                        //start writing

                        while(EEIF==0);         //stay until writing completed

                        EEIF=0;

            }

for(i=0;i<20;i++)

{                     

                        EEADR=i;      //load i as address

                        RD=1;             //start reading

                        LEDS=EEDATA;      //place read data onto the leds

                        delay_1s();

                        RD=0;

            }

}

//-----providing 1sec delay

void delay_1s()

{          GIE=1;

            OPTION_REG=0B00011000;

            T0IE=1;

            for(i=0;i<1000;i++)

            {

                        for(j=0;j<20;j++)

                        {                                  TMR0=0x05;

                                    while(T0IF==0);

                                    T0IF=0;

                        }

            }

}

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