LPTMR Source Clock Frequecy

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LPTMR Source Clock Frequecy

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davidzhou
Contributor V

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

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1 Solution
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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi David,

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

3.8.4.1 LPTMR prescaler glitch filter clocking options.jpg

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

Table 5-1. Clock Summary.jpg

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"

Table 15. MCG specifications.jpg

Best Regards,

Robin

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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi David,

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

3.8.4.1 LPTMR prescaler glitch filter clocking options.jpg

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

Table 5-1. Clock Summary.jpg

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"

Table 15. MCG specifications.jpg

Best Regards,

Robin

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

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davidzhou
Contributor V

Thank you, Robin.

David Zhou

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