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Resets and Interrupts
Resets interrupt program execution and return the program counter and registers to known states.
Resets include Power-on, COP, Clock monitor and external reset.
Interrupts interrupt program execution, push register values and return address onto the stack, and cause program execution to jump to the address indicated in the interrupt vector table.
Execution of the interrupt service routine continues until the RTI instruction is executed; then register values are popped from stack and execution continues from return address.