S12zvl aclk clock deafault value

[charudattaingal]

Dear all,

I want to know the ACLK clock default value in  S12zvl controller to calculate watchdog timer time out.

[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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