http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2009-01-07T17:38:26-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t1066.html 2009-01-07T17:38:26-08:00 hai friends, This is venkat, i am trying to interface the rtc 12887 with p89c51ed2 as per the circuit and the code given in the mazidi book. After initializing and setting the rtc to update the time, I am getting some defualt junk vlaues, even if i remove the rtc iam getting the junk value in hyperterminal. help me please , Thanking you, http://www.8051projects.net/forum-t1066.html 2009-01-07T17:38:26-08:00 Ajay Hi venkat, its easy to interface DS12887, simple map it to port 0 as memory mapped I/O. here is the pin connections...CODE:Controller      DS12887
P0                AD[7:0]
ALE               AS
RD                DS
WR               R/WYou can connect CS to permanent ground if you are not using any other memory IC, if you are using then use a decoding logic. Hope this helps..Please click on thanks button if you are satisfied http://www.8051projects.net/forum-t1066.html 2009-01-07T17:38:26-08:00 Ritesh if u are using hyper terminal then u should use CR command to first clear the screen before the next time display in your code http://www.8051projects.net/forum-t1066.html 2009-01-07T17:38:26-08:00 Ajay he is talking about the garbage he is receiving on the display.. that might be cause of wrong interfacing.. so use the connections as i suggested and test.