Processor Expert Software中的主题 Re: RTC_LDD Processor Expert's component (using FDRM KE02Z40M)

RTC_LDD Processor Expert's component (using FDRM KE02Z40M)

juanignaciotroi — Fri, 06 Mar 2015 20:06:17 GMT

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

Re: RTC_LDD Processor Expert's component (using FDRM KE02Z40M)

Jorge_Gonzalez — Sat, 07 Mar 2015 00:47:09 GMT

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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Re: RTC_LDD Processor Expert's component (using FDRM KE02Z40M)

mjbcswitzerland — Sat, 07 Mar 2015 03:54:01 GMT

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

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