Generate delay of 1 minute using Timer /RTI interrupts in MC9S12DG256B

[suma_success]

Kindly let me know about how to create a delay of 1 minute  using timer interrupts. With prescalar 128 , we get about 2 ms delay!

[ZhangJennie]

Hi Suma

I suggest you take use of processor expert component to set up interrupt period:

after generating code, take a look at the generated TimerInt initialization code.

Have a nice day,

Jun Zhang

[suma_success]

I cannot see the components in processor expert as I have trial version of codewarrior. Is there any method to set delay of 1 sec using timers in  main.c ?

Also , if I use RTI and Timer interrupts in the same program , what would be the priority?

Best Regards,

Suma

On Tuesday, April 21, 2020, 01:25:50 PM GMT+4, ZhangJennie <admin@community.nxp.com> wrote:

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Re: Generate delay of 1 minute using Timer /RTI interrupts in MC9S12DG256B

reply from ZhangJennie in CodeWarrior for MCU - View the full discussion

Hi Suma

I suggest you take use of processor expert component to set up interrupt period:

https://community.nxp.com/servlet/JiveServlet/downloadImage/2-1301113-310648/pastedImage_1.png

after generating code, take a look at the generated TimerInt initialization code.

Have a nice day,

Jun Zhang

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[ZhangJennie]

HI Suma

The lower interrupt vector number, the higher priority. Thus RTI has higher priority.

the timer setting depends on the external clock. what's your external clock? 16M? let me know, I will generate code and send to you.

Jun Zhang

[suma_success]

Thanks a ton.System clock is 48MHz and Bus clock is 24MHz for Timers Oscillator clock is 8MHz for RTI . Warm Regards,Suma

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On Thu, 23 Apr 2020 at 2:23 pm, ZhangJennie<admin@community.nxp.com> wrote:

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Re: Generate delay of 1 minute using Timer /RTI interrupts in MC9S12DG256B

reply from ZhangJennie in CodeWarrior for MCU - View the full discussion

HI Suma

The lower interrupt vector number, the higher priority. Thus RTI has higher priority.

the timer setting depends on the external clock. what's your external clock? 16M? let me know, I will generate code and send to you.

Jun Zhang

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[ZhangJennie]

Suma, 

If Oscilator source is 8MHz. it's not possible to generate 1ms interrupt.see below setting. see below setting, I set the divide register to maximum, the maximal interval is 131.072ms

Thanks,

Jun Zhang