interfacing rtc ds12c887 with 8051

[Mohit Dudani]

Sir,

I wish to interface rtc ds12c887 with 8051.

i have implimented the circuit diagram as well as the code provided by you. But, i’m not getting the desired output.

i’m getting

?

as my output instead of time(hh:mm:ss).

the problem i see that connections  of P3.6 and P3.7 have been made with rw an ds pins respectively. although no output is seen on these pins through programming.

please help me resolve this problem asap.

 

 

[Ashutosh Bhatt]

how do you say no output on P3.7, P3.6.

r u checking them on CRO?

i think your RTC is not getting initialized. please read its datasheet

[Mohit Dudani]

yes i checked it on cro. these pins are always high.

the output on these pins should go from high to low and vice versa in order to initialise as well as transfer data from the rtc.

please help me out 

[Ashutosh Bhatt]

then there is problem in the program

[SHAH DISHANT H.]

Hi,

 

The code is not right. You have to develop your new code as per the datasheet.

 

 

[Author]

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