how to set time and date in rtc ds12c887

[chaitali]

I am making a digital calender using ds12c887 and at89c52. I can read the time from rtc properly. But i cannot write to rtc RAM.

 

code fragment i am using for writing is as follows:

 

void rtc_set()
{
    delay_ms(20);   // it provide 20ms delay
    PBYTE[0x0a]=0x20;    //make oscilator on
    PBYTE[0x0b]=0x83;   // disable updates
    PBYTE[0x04]=0x16;   //set hours
    PBYTE[0x02]=0x58;   //set mins
    PBYTE[0x00]=0x55;   // set secs
    PBYTE[0x07]=0x19;   //set date
    PBYTE[0x08]=0x10;   //set month
    PBYTE[0x09]=0x04;   //set year
    PBYTE[0x0b]=0x03;   //enable updates
}

 

 

Plz help me to find the problem in my code.

 

[AJISH ALFRED]

Hi,

Which microcontroller?

This is not the function which actually do write something to thr RTC !

[chaitali]

microcontroller is atmel 89c52.

 

hey , then plz tell me the function which will write to RTC.

Plz.. Plz…..

[AJISH ALFRED]

Hi Chaitali,

Sorry for the late response. The entire code is with you only, so there must be a function in your code which sends data and receives data from the serial pins of the microcontroller and hence does the writing to the RTC.

[Author]

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