RTC_LDD Processor Expert's component (using FDRM KE02Z40M)

[juanignaciotroi]

Hello. I am new at Kinetis and I am using the FDRM KE02Z40M. I need a clock in my project. There is something that I dont understand. When using the RTC_LDD component (provided by Processor Expert): Do have to add an extra device to my developing board? Such an DS1307 ? or the RTC is integrated inside de MCU?

Thanks

[Jorge_Gonzalez]

Hello Juan:

The RTC_LDD makes use of the internal RTC module, so no need for an external device.

To start using this component, you can refer to the typical usage:

1) Right click on the RTC_LDD -> Help on Component:

2) Click on "Component RTC_LDD Typical Usage":

Regards!,
Jorge Gonzalez

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[mjbcswitzerland]

Hi Juan

The KE devices do have a simple RTC which is however not battery backed - it will also be set back to 0 when a reset occurs.

There is a however a FRDM-KE02Z40M reference here that extends the RTC to a full Gregorian/UTC time/calender, handling day of week and leap years etc. which will also maintain time over resets:

http://www.utasker.com/kinetis/FRDM-KE02Z40M.html#RTC

It adds alarm functions (see the reference for details) and can also be used on other Kinetis parts that have no RTC (eg. KL02 [µTasker FRDM-KL02Z support] or KV types) since it can do this with no HW support (with restrictions that it can't wake from some low leakage modes etc.).

Although not needed by a general "clock", the interface additionally handles daylight saving and time zones (mainly important when used together with SNTP or time servers which don't directly supply the local time).

Regards

Mark

Kinetis: µTasker Kinetis support

KE: µTasker FRDM-KE02Z support / µTasker FRDM-KE02Z40M support / µTasker FRDM-KE06Z support

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