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Showing date and time of a DS1302 RTC into a LM016 LCD

 
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fernandoagf



Joined: 16 Oct 2007
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Showing date and time of a DS1302 RTC into a LM016 LCD
PostPosted: Tue Oct 16, 2007 7:54 pm     Reply with quote

Hello everybody,
I'm just starting programming PICs and I made some small programs, play putiing ports at high and low states, displayed some characteres on a LM016 display.
Now I want to use a DS1302 RTC to tell me the date and time and display it on a LCD display (LM016). I'm using a PIC 16F877a.
I tried a few times but I couldn't get it to work. Could anybody show me how to do that?

Thanks for the help in advance,
Fernando.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Oct 16, 2007 8:06 pm     Reply with quote

See this CCS example file:
Quote:
c:\Program Files\PICC\Examples\Ex_rtclk.c
fernandoagf



Joined: 16 Oct 2007
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PostPosted: Tue Oct 16, 2007 8:32 pm     Reply with quote

Thank you man. It really helped a lot. Now I have one question? In order to put the keyboard to work, do I have to put any resistor between the keyboard and the PIC? Would it be some pull-up resistor? What would be their values?
nother question: The KBD.C driver and the ds1302.c driver are using the same port (B) so I changed the port for the RTC. So now I have the conectors of the DS1302 connected to the pic as follows:
RST on port C2
CLK on port C1
IO on port C3
So I changed the ports on ds1302.c Is it ok? Can I use these pins?
PCM programmer



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PostPosted: Tue Oct 16, 2007 9:02 pm     Reply with quote

The keypad needs pull-up resistors on the Row pins. You can use
4.7K or 10K ohm resistors.

Yes, you can use those other pins for the DS1302.
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