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.

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Allison Wink
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ExperimenterUK
Sat Oct 12 2019, 10:23 PM
Log in.. then post your code in the 8051 forum
Sat Oct 12 2019, 10:18 AM
Bhadra Sajikumar
i am doing a countdown timer with 8051 for my project, unfortunately our professor had to take a leave of absence before he could teach us most of it.. can someone explain the .asm code of it for me?
Mon Sep 23 2019, 07:37 AM
Nathaniel
I am doing a project for my schools wireless security system with cameras,sensors and spot lights using 8051 micro controller, could you help me out with the design and its source code.
Wed Sep 18 2019, 08:48 PM
Caryn Kover
Thank you for your time,
ExperimenterUK
Mon Aug 05 2019, 07:09 PM
@Ismail ..post in forum, give details
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Ismail balghmi
Hello. Please I won't download
ExperimenterUK
Wed Jul 24 2019, 12:47 AM
@BUSTER123 Please post in the forum
Tue Jul 23 2019, 06:13 PM
BUSTER123
hello! newbie here. i am kind of a guy who hates using ready - made existing libraries, so this helped a lot as i was trying to control and write to a character lcd display. however, i can't figure out how to set the cursor position. for example, i want to set it to the 5th column in the first row, so position 5. so according to the table, i am sending 10000101 on the 8 data lines of the lcd (register select pulled low). the cursor does not move there however. and i cant move the cursor left or right too. is it something wrong that i am doing? thank you.
ExperimenterUK
Thu Jul 11 2019, 07:55 PM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html

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ty, really needed it
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Your code seems okay on my simulationTry my code o...
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