S12ZVL Watchdog (cop)

[charudattaingal]

Dear team,

I want to know the default value of ACLK clock in S12zvl controller .I need to calculate value of cop time out period.while selecting cop clock source is ACLK.

its good to have if i get example of same .

[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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