PIC16F84 and DS1307 dosen't work properly

[Bombay]

Hi
I 'm start my digital clock project with PIC16F84 and DS1307 but
the PIC16F84PIC16F84 and DS1307 dosen't work properly.
It can't even enable oscillator for DS1307. I use I2C driver from CCS
example.

Now I looking for a new source code for ds1307.

Please

[Ttelmah]

I'd look again at your wiring to the chips, things like the pull-up resistors on the I2C lines, which pins are connected, make sure no other peripheral is using the pins, and verify that each line is working properly.
The demo code _does_ work.
If the problem is still not obvious, come back with how you have things connected, what compiler version you are using etc..

Best Wishes

[asmallri]

Have you connected the battery? The DS1307 will no work correctly without it.
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[MAX3000]

Hi Bombay

Are you sure ?
1.You must pull-up SDA and SCL pin with R 10K
2.Connect 3V battery to DS1307
3.What frequency of your crystal

more detail check out this DS1307 Example

[Bombay]

Thank every body.

I have programming as MAX3000 introduce but it still dosen't work.
I don't know what is the problem.

My crystal 4 MHz and also connected 3V battery to DS1307 with R10 K pull-up on SDA and SCL pin.


Please help

Thank.
BB

[Mark]

I think they are asking the crystal speed connected to the DS1307.

[Ttelmah]

What voltage is the PIC running at?. This one is 'vital'. The DS1307, won't allow you to talk to it, till the main supply rail reaches at least 1.25* the voltage on the battery pin. If the battery pin has (say) a lithium battry operating at 3.3v, the PIC's supply, must be over 4.125v, for the unit to work. This one can be very much a problem, when some batteries 'out of the box', give slightly more voltage than they are meant to give...

Best Wishes