Kinetis MicrocontrollersのトピックRe: problem for Core-M4 systemtick clocksource

problem for Core-M4 systemtick clocksource

AaronsCook — Wed, 27 Nov 2013 13:08:33 GMT

Hi, All

I have a question what is the Core-M4 systemtick clock source When use K60？

I configure the systick as

SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |

SysTick_CTRL_TICKINT_Msk |

SysTick_CTRL_ENABLE_Msk;

SysTick_CTRL_CLKSOURCE_Msk means CLKSOURCE = 1

CLKSOURCE Indicate s the clock source:

0 = external clock

1 = processor clock.

CLKSOURCE = 1 means select processor clock.

What is processor clock in the K60? It is core clock such as 100Mhz?

Thank you

Best Regards

Wang Song

Re: problem for Core-M4 systemtick clocksource

Paul_Tian — Thu, 28 Nov 2013 00:56:50 GMT

Hi, Wang Song

The core clock depends on your clock setting. In our reference manual, you can find core clock is MCGOUTCLK divided by OUTDIV1 clocks the ARM Cortex- M4 core in chapter "clock distribution". So it depends on your MCG module setting.

Hope my reply can help you.

Best Regards

Paul

Re: problem for Core-M4 systemtick clocksource

kerryzhou — Wed, 11 Dec 2013 02:21:59 GMT

Hi, Wang Song

I think this picture from reference manual will help you to understand what is the core clock of MCU.

Best regards!

Jing

Re: problem for Core-M4 systemtick clocksource

AaronsCook — Wed, 11 Dec 2013 05:00:43 GMT

Hi,Jing

Thank you for your help.

Best Regards

Wang song