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Interrupt
                    User program                   handler X











                                                                                Interrupt
                                                                               handler Y











                                         (a) Sequential interrupt processing


                                                   Interrupt
                    User program                   handler X










                                                                                Interrupt
                                                                               handler Y












                                          (b) Nested interrupt processing
                    Figure 3.13 Transfer of Control with Multiple Interrupts




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