topic Re: Question in ColdFire/68K Microcontrollers and Processors

Question

mishra_shrutiki — Mon, 13 May 2019 07:13:20 GMT

What are the steps i should follow so that my board will come out of sleep mode using UART function as i am learning demo (power_manager_hal_demo) examples of freescale semiconductor MK24FN1M0VLQ12. Can you give sample code?

Re: Question

vicentegomez — Mon, 13 May 2019 19:02:12 GMT

Would be possible that you tell us the device that you are using?

Thanks

Re: Question

TomE — Tue, 14 May 2019 03:18:09 GMT

The OP the device in his post. It is a Kinetis K24. So this post is in the wrong forum.

MK24FN1M0VLQ12 Product Information|NXP

OP, please move your post to here (there's a "move" option, probably under "Actions" on this page):

Kinetis Microcontrollers

Tom

Re: Question

mishra_shrutiki — Tue, 14 May 2019 05:27:34 GMT

Sorry for wrong information.It is Kinetis K24 microcontroller. NXP is manufacturer and MK24FN1M0VLQ12 is manufacturer part number. I am trying to understand the power_hal_demo example,but still its not clear . I have to enable the RXEDGIE (RxD Input Active Edge Interrupt Enable)in uart baud rate register ,through which it will come out of sleep mode.But i don't know what are the steps,before and after enabling the RXEDGIE .

Re: Question

Hui_Ma — Tue, 14 May 2019 06:32:51 GMT

Hi,

It need to enable UART interrupt before enter into low power mode.

Please check K24 reference manual chapter 51.6.1 RXEDGIF description for the detailed info:

S2[RXEDGIF] is set when an active edge is detected on the RxD pin. Therefore, the active edge can be detected only when in two wire mode. A RXEDGIF interrupt is generated only when S2[RXEDGIF] is set. If RXEDGIE is not enabled before
S2[RXEDGIF] is set, an interrupt is not generated.

If possible, please move this thread to https://community.nxp.com/community/kinetis forum.

Thanks for the understanding.

best regards,

Mike

Re: Question

mishra_shrutiki — Mon, 20 May 2019 13:13:09 GMT

Hello Hui_Ma,

I initialized the UARTx_BDH for intance 4 ,but i initialized in main function due to that it stop sending data to real term .Can you tell me where should i initialize it?

Re: Question

Hui_Ma — Thu, 23 May 2019 01:34:20 GMT

Hi,

When customer want to change the UART baud rate, it need to disable UART TX and RX at first (UARTx_C2 register [TE/RE] bits). Then change related baud rate, after that re-enable TX and RX again.

Have a great day,
Mike

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