Discussion in "Project Help" started by    venkat    Jun 20, 2007.
Wed Jun 20 2007, 04:02 AM
#1
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,
Tags DS12C887 interfacing with 8051RTC DS12C887 interfacing
Wed Jun 20 2007, 07:18 AM
#2
Hi venkat, its easy to interface DS12887, simple map it to port 0 as memory mapped I/O. here is the pin connections...
Controller      DS12887
P0                AD[7:0]
ALE               AS
RD                DS
WR               R/W

You 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
Wed Jun 20 2007, 12:15 PM
#3
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
Wed Jun 20 2007, 01:01 PM
#4
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.

Get Social

Information

Powered by e107 Forum System

Conversation

Thu May 06 2021, 01:11 PM
Karen
Hello, constantly i used to check blog posts here in the early hours in the morning, since i like to find out more and more. Local Dating https://datingsitesww.com
Thu May 06 2021, 12:33 PM
Shalanda
It's an remarkable article in support of all the web people; they will get benefit from it I am sure. senior dating sites http://onlinedatingdd.com/
Thu May 06 2021, 10:24 AM
Felisha
What's Taking place i am new to this, I stumbled upon this I have discovered It absolutely useful and it has aided me out loads. I hope to contribute & help other users like its helped me. Good job. match dating https://onlinedatingtind.com/
Tue May 04 2021, 08:34 PM
Chastity
Hi there! I could have sworn I've been to this site before but after browsing through some of the post I realized it's new to me. Anyways, I'm definitely glad I found it and I'll be book-marking and checking back frequently! check my score https://creditscorecheckn.com
Tue May 04 2021, 06:39 PM
Clarence
What's up everyone, it's my first go to see at this web page, and post is really fruitful in support of me, keep up posting these types of articles. Best Credit Score https://creditscoresids.com

Downloads

Comments

Mirza123
Thu Jun 25 2020, 03:46 PM
eunicelove124
Mon Jun 22 2020, 03:03 PM
cerouno
Tue Jun 16 2020, 05:10 PM
Marce
Sat Jun 13 2020, 09:43 PM
Davidthils
Thu May 21 2020, 12:44 PM
Jakeror
Thu May 21 2020, 01:28 AM
motorCar
Wed May 20 2020, 07:05 PM
Vordrync
Wed May 20 2020, 11:52 AM

Online

Guests: 115, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 38215
Newest member: Mirza123