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You are here: Home / Replies /  Answers to your questions

 Answers to your questions

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Electronics › Electronics › Building digital clock thak have alarm and fire alarm ›  Answers to your questions

May 19, 2012 at 6:27 pm #7858
AJISH ALFRED
Participant

 

Answers to your questions inline

 

1) There won’t be synchronisation issues due to different crystal frequencies. 32khz crystal is used for 

     the internal clock of ds1307 only, means only to update the registers of rtc. While we try to read, the 

     data is copied to a register from where we read it, while the actual data keep on updated without any

     disturbance

 

2) You should get I2C code running in your MCU, which will enable a pair of pins as sda and scl. The

    code will be complex, but you can download it from internet

 

3) You can set the time and date by setting the registers of rtc. It can be done in both 12 hour or 24 hour

    mode. Those details are available in the datasheet.

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