Kinetis MicrocontrollersのトピックLPTMR Source Clock Frequecy

LPTMR Source Clock Frequecy

davidzhou — Mon, 02 May 2016 16:09:45 GMT

Hi,

I have TWRK60F120MUM tower board. In Low Power Timer PSR field: From manual K60P144M150SF3RM.PDF, Page 1252:

LPTMRx_PSR field descriptions (continued)

PCS

Prescaler Clock Select

Selects the clock to be used by the LPTMR prescaler/glitch filter.

NOTE: See the chip configuration details for information on the connections to these inputs.

00 Prescaler/glitch filter clock 0 selected.

01 Prescaler/glitch filter clock 1 selected.

10 Prescaler/glitch filter clock 2 selected.

11 Prescaler/glitch filter clock 3 selected.

I have hard time to find the actual source clock frequency for each of the clock selection from 00 to 11.

Can you help you to point to the location of a document that can tell me the actual frequency of the source clock selections?

Thank you,

David Zhou

Robin_Shen — Tue, 03 May 2016 06:56:41 GMT

Hi David,

These four clock sources can be found in "3.8.4.1 LPTMR prescaler glitch filter clocking options"

The clock frequency can be found in "Table 5-1. Clock Summary".

Please read the datasheet K60P144M120SF3 for more detail.

For exmaple: If MCGIRCLK is selected, detail descriptionts of internal reference frequency(slow and fast clock) are in "Table 15. MCG specifications"

Best Regards,

Robin

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davidzhou — Tue, 03 May 2016 14:06:24 GMT

Thank you, Robin.

David Zhou