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Doubts on Initialize timer interrupt

Hi all,

i am new to embedded system and hope someone can solve my doubts.

i am reading this example that i have and i came across these.

 

1) T0MR0 = 59999; // 1mSec = 60000 - 1 counts

 

Where does this '60000' come from?

 

2) VICVectCntl0 = 0x20 | 4;

 

What does '0x20 | 4' mean?

 

I am very confused of all these values. Hope to hear from someone soon!

 

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