What may be the possible cause for RTS1307 Module(Purchased from Market) get fast approximately 1sec in 3hrs.
Let me elaborate what I have done,
My code is in xc8 and internal osc configured in 8mhz at mcu16f887.
Display is 7segments 8inch 6-digit, data being extraxted from RTC1307 (MODULE) with I2C, techique Multiplexed and two button is used for time setting in h/w side. All are going correctly, but
Once adjusting time with the actual, it is found that after (apprx) 3-4 hours 1-second of its going forward. Is it the problems of RTC1307 Module or others of my h/w or software.
As per my openion that could be only for the cause of RTC module, if so then how do i get rid of that..