Dear all,
Now I found the problem, now it is working as usual, I did in reset pin number 9 of AT89C52 just touch a wire with 5 volt positive 3 – 4 times now it is work as 12hrs format, after (0) 9 : 5 9 it is going to 1 0 : 0 0 and as usual, I mean that 4th digit of 10hrs digit is working, I think this happen is reset problem (why, I don’t know), This circuit is already having reset circuit that is one 10mfd capacitor connected with 5 volt positive and one 10 k resistance is connected with ground.
And I am having another one problem in it, that, when touch with a metal piece (forceps or naked screwdriver) in any (positive or negative) pins of any ICs in this circuit, suddenly changes going in the display digits I mean, some segments are, on or / and off (Random) its self, after fraction of seconds it is back to normal, working OK, why this happen, this circuit have connected a 100 N disc capacitor in each 74LS595 ICs vcc to with ground.
Thanks.