problem in rtc ds12887 and 8051 c code

Hi I am mac using ds12887 +89c51 for date and time display. code runs initially and then malfunction. please help me. here with attaching code and proteus design file

I actually do not see any issues in the program. When you say malfunction, what exactly is happening?

[Topic moved to 8051 Discussion Forum]

Actually It shows correct time up to 16:58:08 then it start printing 58:58:58 and some other till second count reach to x8 and then shows correct time again and continued...
pls help me to rectify the problem. here with sending some screen snaps

I think problem is in simulation not your actual code. I have checked and Proteus says Logic contention on address data lines. so its reading same byte for all three reads. I think you should give a try on real hardware instead of doing this on software simulation.

ok thanks. I will try this one.

hi can control 4x4 keypad and 16x2 lcd on same data line using 74HC574 AND 74HC245. IF POSSIBLE PLS SEND ME CONNECTION DIAGRAM
PLS WAITING FOR REPLAY.

If you run the display in 4 bit mode you only need 6 lines.
I think you can manage without any extra chips.
If not, then use something like a 74245 as an isolator by controlling its' enable pin.

Check the net for examples.

Is there a specific requirement? why to unnecessary complicate things?

k thank u all. I will