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DS1302 RTC interfacing with pic

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galib.tan

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Hi,
I'm new to rtc. I just want to design and build a digital clock using DS1302 and pic 16F877A. I've done synchronous serial communication using usart module and read the datasheet of DS1302 several times. But, things aren't clear to me. I can't get the starting point. All I understood is I've to send some control byte and address of registers to write and read data. Could anybody help me with the complete working flow? I want to write the code myself.
Galib.tan
 

why 1302 why not 1307 ?

Best you will learn from example. Here is one example you can find it complete on internet :

PROJECT : INDUSTRIAL AND DOMESTIC TIMER
AUTHOR : JESWANTH MG
COMPILER : HI-TECH PIC C COMPILER 9.60 IN PRO MODE
 

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  • DS1307.c.txt
    1.9 KB · Views: 132
  • main.c.txt
    3.9 KB · Views: 96
Last edited:
Hello tpetar,
yes,DS1307 is a nice chip,and now I use it too.but when I promote 20 pieces,someone not work.Do you see the same effect ?
Of course,the power(VCC,Vbat) all be ok,and (CH) bit cleared to 0.MCU I2C port is ok too.but somepiece's crystal not work,someone is ok!? I do't know why?
tpetar said:
why 1302 why not 1307 ?

Best you will learn from example. Here is one example you can find it complete on internet :

PROJECT : INDUSTRIAL AND DOMESTIC TIMER
AUTHOR : JESWANTH MG
COMPILER : HI-TECH PIC C COMPILER 9.60 IN PRO MODE
Click to expand...
 
Last edited:

hi tpetar
I want to use DS1302 because I already have two of them. However, I'm trying to understand the codes you sent. It would be a great help if you tell me the steps to program. I mean what and what I have to do sequentially.
 

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