How to calculate PIT PIT_LDVALn register value

[irmantasbudrys]

Hello All,

I am using FRDM DEV BRD KEAZ128 and S32. Bus frequency is 24MHz. Lets say I want interrupt every 1ms. Could you explain me how to calculate PIT_LDVALn register value to generate this interrupt? 

Best Regards,

IB

[kerryzhou · Accepted solution]

Hi Irmantas Budrys,

     Actually, the calculation is very simple.

    You also can refer to the KEA128 reference manual, chapter 28.5 Initialization and application information.

   If your bus clock is 24Mhz, then you want to get 1ms, the pit clock is the bus clock, so:

  PIT_LDVALn = 1ms /bus clock =24000= 0x5dc0.

Wish it helps you!

If you still have problem, please contact me!

Have a great day,
Kerry

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