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DWMC – Lecture3 Interrupts

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Interrupts

What?
External/internal signal to change the flow of execution
Why?
Service request by a device
Interrupt Service Routine / Handler

Interrupt vector table

ISR:
Has fixed memory location
IVT
Set of locations set aside to hold addresses of ISRs

Interrupts in 8051

6 interrupts
Reset
Timer1 and Timer2
H/w external interrupts : P3.2 (INT0) and P3.3(INT1)
Serial commn