K20 RTC

[vanajagujjala]

Hello,

          I have a doubt on RTC,without external 32KHZ oscillator can we run the RTC in MK20DX128VLH5?Is there any other option to RTC wothout external 32KHZ oscillator.

any body please help me urgently.

Thanks

vanaja

[Hui_Ma]

Earl Goodrich II comments is quite correct.

The RTC module needs external 32.768KHz clock as clock source to keep RTC module keeping working with VBAT power supply.

Wish it helps.

Have a great day,
best regards,

Ma Hui

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[vanajagujjala]

Thanks for the Reply.

Thanks,

vanaja.

[egoodii]

You don't really say what you want to use the RTC registers FOR.  If you want any kind of timekeeping accuracy, or operation from battery while the rest of the CPU is 'off', then using the 32KHz input is indeed going to be necessary, whether that be a crystal or as a precision 32KHz oscillator input.