Interrupt sequence - PowerPoint PPT Presentation

Input and output Supervisor mode, exceptions, traps

Input and output Supervisor mode, exceptions, traps. I/O devices. Usually includes some non-digital component Typical digital interface to CPU:. status reg. CPU. mechanism. data reg. Example : 8251 UART.

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Basic Instruction Cycle

Basic Instruction Cycle. other instructions. execute instruction. fetch next instruction. start. STOP. stop instruction. execute cycle. fetch cycle. Instruction Cycle with Interrupts. If interrupts disabled. fetch next instruction. execute instruction. STOP. start.

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