ColdFire/68K Microcontrollers and ProcessorsのトピックRe: Setting up the Real Time Clock in the Coldfilre MCF52223 micro

Setting up the Real Time Clock in the Coldfilre MCF52223 micro

JimMcP — Mon, 10 Mar 2008 22:14:12 GMT

Is there any code example on setting up the Real Time Clock in the MCF52223. And to be able to read and write to it.

Thanks,

Re: Setting up the Real Time Clock in the Coldfilre MCF52223 micro

mjbcswitzerland — Tue, 11 Mar 2008 00:58:40 GMT

Hi Jim

Take a look at the following link which discusses the RTC in the M5223X (I belive it is identical to the RTC in the M52223).

http://www.utasker.com/forum/index.php?topic=35.0

The RTC is fully supported in the uTasker project and also simulated in the uTasker simulator.
Complete code and a demo is available in the latest service pack - the project also supports the M52223.

Regards

Mark

Re: Setting up the Real Time Clock in the Coldfilre MCF52223 micro

JimMcP — Wed, 12 Mar 2008 01:45:36 GMT

The real time clock frequency setting fot the MCF52223 is it

MCF_CLOCK_RTCDR = 48000000;

OR

MCF_CLOCK_RTCDR = 25000000;

Re: Setting up the Real Time Clock in the Coldfilre MCF52223 micro

mjbcswitzerland — Wed, 12 Mar 2008 04:12:22 GMT

Hi Jim

I believe that the oscillator input is valid.

The M52223 is generally clocked from 48MHz (due to USB) so
MCF_CLOCK_RTCDR = (48000000-1); seems to be the exact value required.

Regards

Mark