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HW_8-soln - i s s as is Q 5?“ in i an i9 53 5’ is as i...

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Unformatted text preview: i s s; as is Q 5?“ in i an i9 53 5’? is? as i in 519‘- {is :3” #5:} 5:5 , E5 :3 3 w, is"? s “*5” g ‘4, W 145‘" Answer: A maskable interrupt is under user control. A nonmaskable interrupt is one that can not be turned off by the user under software control. The nonmaskable interrupt has higher priority than the maskable interrupt. ‘ 1’ Answer: An “interrupt” is an unscheduled break in normal computer operation to handle a higher priority event. When an interrupt occurs, the 68H012 will finish the instruction (except fuzzy logic rule instructions) it is currently executing, store key register values, and then perform an interrupt service routine (ISR) associated with that specific interrupt. Once the interrupt event has been serviced, the 68H012 will restore its key register values and continue processing where it left off When the interrupt event occurred. @253? X Ztl/Mf? :5 a} F ‘2 ii is; if; sigh. @rwré "ii” mi 5"; <2: , i is; ifi 55%; 9%% Answer: Recall that the stack pointer holds the 16-bit address of the last stack location used. 1) The return to the first subroutine would be $A2DB. The return back to main 1s $7276. :2} "Ehe return address back to main is $A2DB. The Y register veins is $7276. 3) The return address back to main is $F201. It) The return address back to main is $A2DB. ...
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