The solutions to the above depend on who you are.
A B Cin | Cout S ------------+--------- 0 0 0 | 0 0 0 0 1 | 0 1 0 1 0 | 0 1 0 1 1 | 1 0 1 0 0 | 0 1 1 0 1 | 1 0 1 1 0 | 1 0 1 1 1 | 1 1
; in the spirit of the PDP-11 and the M68000 MOVE B,R1 ADD #5,R1 MOVE R1,A ; in the spirit of classical single accumulator machines LDA B ADDI 5 STA A
An interrupt service routine is a block of code (akin to a procedure or function) that is called asynchronously to handle an event detected by the hardware. In this context, the word asynchronous means that the transfer of control is not caused by a call instruction in the program that is currently running, but is caused by something external to the instructions being executed at the time the control transfer is initiated.Interrupt service routines typically return to the code that was interrupted by way of a return instruction of some kind, typically a return from interrupt instruction. Interrupt service routines typically handle the interrupt by moving data or taking other actions that reset the condition that initiated the interrupt.