Hi, I just can not run interrupt for Timer0 correctly. For example, I set I register to 10h and IL register to 70h and when interrupt takes place , CPU should start INT service routine from physical address 01074h. Am I right?
Thank you, Val
No.
Only the high 3 bits of the vector are from IL, the low 5 bits of the vector are 00100 for Timer 0. Using your example, the address of the ISR will be fetched from 01034h, not 1074h.
Just to be clear, the vector table holds the address of the ISR, not the first instruction of the ISR.
vector
first
Using this example, the address of the ISR will be fetched from 01064h. Thank you.
I knew I should have drawn the bits on paper. :-)
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