Hello,
I have pic16f887 and i want to connect the RTC module with it, Module from provotech, it has scl and sda.
according to little research it say to connect the SQW to timer interput at 1Hz something like that!!


Thanks

 

"scl" and "sda" sounds like the I2C bus, known as the MASTER SYNCHRONOUS SERIAL PORT (MSSP)MODULE and lives on pins 23 (SDA) and 24 (SCL).

To receive an interrupt signal tie it to a suitable pin such as pin 33 (INT).

I would also say a bit more research is required.

 

Hello,
The data sheet says....

The address map for the DS1307 RTC and RAM registers. The RTC registers are located in address
locations 00h to 07h. The RAM registers are located in address locations 08h to 3Fh. During a multibyte access,
when the address pointer reaches 3Fh, the end of RAM space, it wraps around to location 00h, the beginning of
the clock space.

00 to 007h mean display register!
But what about 08h to 3fH mean here?

 

It means that there are 56 bytes of RAM at location 08h to 03Fh. That statement was just about as clear as it could be. What did you think it meant?

 

Hello,
Need of it where to use it?
and after that how to work with DS1307 to get time and dates?

 

That's up to you. It's just another resource, you can use it or ignore it.
The time and dates are in the datasheet

 

http://www.edaboard.com/thread112218.html

 

Hello,
I will use 7 segment LED display..
only min and hours.
so, how to start in Hi tech c i have done i2C based project in BLDC ESC motor.

thanks

 

Hello,
How to use PIC16F887 AS DIGITAL INPUT OUT ?
What is this?
PBADEN = 0ff

 

What does the datasheet say?

 

Hello,
It is done by Ian
The pic18 has the PBADEN.... On the pic16 you need to use " ANSELH = 0;"

 

Hello,

Here is code i have updated how to read I2C function is not present, how to read from DS1307

#include <htc.h>
__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS);
#define _XTAL_FREQ 20000000
#define SDATA RC4
#define SCLK RC3
void I2C_init(),I2C_start(void),I2C_write(char x), I2cSTOP(void);  
void i2c_Wait(void);
char data[13]={  0b00010000,0b01111101,0b00100011,0b00101000,0b01001101,0b10001000,
0b10000000, 0b00111101,0X00,0b00001000};
void main(void){
ANSELH = 0;
    TRISC3=1; //direction to input have be changed
    TRISC4=1;
unsigned char ch=0;
TRISC0=0;
TRISB=0X00;
TRISD=0X00;
TRISC1=0;
TRISC2=0;
RC0=0;
RC1=0;
RC2=0;
__delay_ms(500);
    I2C_init();
__delay_ms(50);

    I2C_start();
    I2C_write(0xd0);//  DS1307 addr

I2C_write(0x00);//    ds1307 addr
I2C_write(0x01);//   writing 1 sec
I2cSTOP();
while(1){
    I2C_start();
    I2C_write(0xd0);//  DS1307 addr
    I2C_write(0x00);//ds1307 addr
    I2C_start();
    I2C_write(0xd1);//DS1307 addr bit high for reading
    ch = I2C_Read();  //  how to read it??

I2cSTOP();
RD0=0;
RD1=0;
RD2=0;
RD3=1;
PORTB=data[ch];
__delay_ms(500);
PORTB=0B00000000;




}
}
void I2C_init(void)
    {
  SSPCON = 0x38;      // set I2C master mode
SSPCON2 = 0x00;
SSPADD = 0x0C;  //400KHZ  20MHz xtal
SSPSTAT|=0X80;
PSPIF=0;      // clear SSPIF interrupt flag
BCLIF=0;      // clear bus collision flag
}
void I2C_start(void)
{
    i2c_Wait();
    SEN=1;
}
void I2C_write(char x){
    i2c_Wait();  
SSPBUF=x;
        }
void i2c_Wait(void){
    while((SSPCON2 & 0X1F || (SSPSTAT & 0X04)));
}
void I2cSTOP(void)
{
    i2c_Wait();
    PEN=1;
}

 

Hello,

Now i am understand the working of start and stop now i want to learn addr and read process!

 

Hello,
here is code of it for pic but incomplete..

http://www.8051projects.net/wiki/DS1307_I2C_RTC_Interfacing_Tutorial

 

Hello,
I have modified the code simple version.
please have a look i have write 0x0f in sec register @ 0x00h addr to watch the change after this i am reading the i2c buffer register to get value!
In MPLAB build successful, hanging at in debugger can we test code in this?
void i2c_Wait(void){
while((SSPCON2 & 0X1F || (SSPSTAT & 0X04)));
}

#include <htc.h>

__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS);
#define _XTAL_FREQ 20000000
#define SDATA RC4
#define SCLK RC3
void I2C_init(),I2C_start(void),I2C_write(char x), I2cSTOP(void);   
void i2c_Wait(void);
char data[13]={  0b00010000,0b01111101,0b00100011,0b00101000,0b01001101,0b10001000,
0b10000000, 0b00111101,0X00,0b00001000};

void main(void){
ANSELH = 0;
    TRISC3=1; //direction to input have be changed
    TRISC4=1;
unsigned char ch=0;
    unsigned char i;
TRISC0=0;
TRISB=0X00;
TRISD=0X00;
TRISC1=0;
TRISC2=0;
RC0=0;
RC1=0;
RC2=0;
//__delay_ms(500);
    I2C_init();
//__delay_ms(50);

    I2C_start();
    I2C_write(0xd0);

I2C_write(0x00);
I2C_write(0x0f);

   
I2cSTOP();
 
while(1){
    I2C_start();
    I2C_write(0xd0);
    I2C_write(0x00);
    I2cSTOP();
    I2C_start();
    I2C_write(0xD1);
   i= SSPBUF;

    I2cSTOP();
}


RD0=0;
RD1=0;
RD2=0;
RD3=1;
PORTB=data[i];
__delay_ms(500);
PORTB=0B00000000;


}

void I2C_init(void)
    {
  SSPCON = 0x38;      // set I2C master mode
SSPCON2 = 0x00;
SSPADD = 0x0C;  //400KHZ  20MHz xtal
SSPSTAT|=0X80;
PSPIF=0;      // clear SSPIF interrupt flag
BCLIF=0;      // clear bus collision flag
}
void I2C_start(void)
{
    i2c_Wait();
    SEN=1;
}
void I2C_write(char x){
    i2c_Wait();   
SSPBUF=x;
        }
void i2c_Wait(void){
    while((SSPCON2 & 0X1F || (SSPSTAT & 0X04)));
}
void I2cSTOP(void)
{
    i2c_Wait();
    PEN=1;
}

 

Hello,
Can any one help me about I2C with DS1307?

 

I2C_write(0xd0);
Is this where you get an error?

 

Hello,
Here is the codei want only min and hours but not working display and | | on segment!

#include <htc.h>

__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS);
#define _XTAL_FREQ 20000000
#define SDATA RC4
#define SCLK RC3
void I2C_init(),I2C_start(void),I2C_write(char x), I2cSTOP(void);   
void i2c_Wait(void);
char data[13]={  0b00010000,0b01111101,0b00100011,0b00101000,0b01001101,0b10001000,
0b10000000, 0b00111101,0X00,0b00001000};

void main(void){
ANSELH = 0;
    TRISC3=1; //direction to input have be changed
    TRISC4=1;
unsigned char ch=0;
unsigned char i=0;

TRISB=0X00;
TRISD=0X00;
PORTB=0B00000000;
__delay_ms(500);
    I2C_init();
__delay_ms(50);

    I2C_start();
    I2C_write(0xd0);

I2C_write(0x00);
I2C_write(0x02);

I2cSTOP();

RD0=0;
RD1=0;
RD2=1;
RD3=0;

PORTB=data[5];
__delay_ms(800);
PORTB=0B00000000;
   
RD0=0;
RD1=0;
RD2=0;
RD3=0;

    I2C_start();
    I2C_write(0xd0);
    I2C_write(0x00);

    I2cSTOP();
while(1){
    I2C_start();
    I2C_write(0xD1);
   i= SSPBUF;

    I2cSTOP();


RD0=1;
RD1=0;
RD2=0;
RD3=0;
PORTB=data[i%16];

__delay_ms(500);
PORTB=0x00;

RD0=0;
RD1=1;
RD2=0;
RD3=0;
PORTB=data[i>>4];

__delay_ms(500);
PORTB=0x00;




}
}
void I2C_init(void)
    {
  SSPCON = 0x38;      // set I2C master mode
SSPCON2 = 0x00;
SSPADD = 0x0C;  //400KHZ  20MHz xtal
SSPSTAT|=0X80;
PSPIF=0;      // clear SSPIF interrupt flag
BCLIF=0;      // clear bus collision flag
}
void I2C_start(void)
{
    i2c_Wait();
    SEN=1;
}
void I2C_write(char x){
    i2c_Wait();   
SSPBUF=x;
        }
void i2c_Wait(void){
    while((SSPCON2 & 0X1F || (SSPSTAT & 0X04)));
}
void I2cSTOP(void)
{
    i2c_Wait();
    PEN=1;
}

 

Hello,
In this setting will ds1307 will work fine?

void I2C_init(void)
    {
  SSPCON = 0x38;      // set I2C master mode
SSPCON2 = 0x00;
SSPADD = 0x0C;  //400KHZ  20MHz xtal
SSPSTAT|=0X80;
PSPIF=0;      // clear SSPIF interrupt flag
BCLIF=0;      // clear bus collision flag
}