RTC DS1307 crystal pins

[ahmad.e.c.m]

What speed crystal do you have on pin 1 and 2... You need to use a 32khz one... you also need a 3v battery across pins 3 and 4... Have you a scope to check the crystal is running???

yes the crystal is 32.768.
I also am using 3 volts.
Where do I measure?

 

[ahmad.e.c.m]

mr "skmdmasud"

After I turn off my microcontroller oscillator is turned off.
If I do it again I get the information I need to set the ch bit.
In this case, The second change.

 

[Ian Rogers]

Probe both OSC pins to see the xtal ripple.. You should see a decent clocking wave on OSC2..

Why do you think it's not running????

 

[ahmad.e.c.m]

Probe both OSC pins to see the xtal ripple.. You should see a decent clocking wave on OSC2..

Why do you think it's not running????

Because After turning off the microcontroller base 7 will not start,
It indicates that the oscillator is not active anymore.

 

[Ian Rogers]

No! It indicates that your battery backup isn't connected.... If there is no external battery, when you cycle the DS1307's power, it defaults to power on reset..

 

[ahmad.e.c.m]

Really??
I replaced the battery 3 V, 9 V battery I use.
I am using two resistors, 9 volts to 3 volts would become.
Is there a problem?

 

[Ian Rogers]

Does your circuit resemble this????

 

[ahmad.e.c.m]

yes
I am using the 9V battery.
I'll convert it to 3 V.
(With two resistors)

 

[Ian Rogers]

If you take the 3v battery backup power away. the DS1307 just resets.... The battery should stay there always...

 

[ahmad.e.c.m]

Thank you
If the problem happens again, I will let you know.