RTC I2C with at89c51 interfacing

[jay_3189]

Hello Can Anyone Help me to interfacing RTC DS1307(I2C) with 89c51.
Is PWM code is needed to give clock to RTC.

Please Give me C code if any one have or give me idea to write code step by step.

Description:

I want to automate 6 valves using RTC Timing and by that time i also want to create files and folder in my computer database.
I am not using LCD Display in this.

 

[jayanth.devarayanadurga]

You need a crystal of 32.768 KHz for DS1307 and a 3V battery.

 

[jay_3189]

You need a crystal of 32.768 KHz for DS1307 and a 3V battery.

Ya i have already used that crystal oscillator but is there PWM needed. or need of that.

 

[Golden Electronics]

No need of PWM clock refer my blog on RTC

 

[jay_3189]

You need a crystal of 32.768 KHz for DS1307 and a 3V battery.

Is that needed to keep only 32.768KHz crystal frequency. why not other?