S12ZVL ACLK clock deafault value and COP

[charudattaingal]

Dear Team,

I want to know the default value of ACLK clock available in S12ZVL controller .

It is good to have if I get example of watchdog timer for S12zvl controller.

Thanks & Regards,

Charudatta

L&T Technology Services Ltd

www.LntTechservices.com<;http://www.lnttechservices.com/>

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[RadekS]

Hi,

Nominal value of ACLK is 20kHz.

ACLK frequency is divided by 2 when ACLK is selected as clock source for watchdog:

So, 10kHz is source clock frequency for COP watchdog.

Minimum timeout (CPMUCOP_CR=0x01, CPMUCLKS _COPOSCSEL1=1) is 2^7*(1/10kHz)=12,8ms

Maximum timeout (CPMUCOP_CR=0x07, CPMUCLKS _COPOSCSEL1=1) is 2^17*(1/10kHz)= 13,1072s

Note: ACLK frequency could be trimmed by modifying CPMUACLKTR register value. Note: After reset a value is automatically loaded again from the Flash memory.

I hope it helps you.

Have a great day,
RadekS

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[charudattaingal]

Dear RadekS,

Thanks for answer. The value of ACLK is not mention in S12zvl datasheet .

May I know how you got  ACLK value.

Thanks & Regards

Charudatta

[RadekS · Accepted solution]

Hi,

This information is directly from MC9S12ZVL Family Reference Manual Rev. 1.04

Please look at chapter A.2.1 VREG Electrical Specifications (page 685), parameter 7,

Trimmed ACLK output frequency, typical value fACLK=20kHz.

I hope it helps you.

Have a great day,
RadekS

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[charudattaingal]

Thank you very much