The AMD64 architecture allows software to define up to 15 external interrupt-priority classes.
2.
Loading TPR with 15 ( 1111b ) disables all external interrupts.
3.
The Stop Mode includes analog comparators, watchdog timers, pulse counters, I2C links, and external interrupts.
4.
Loading TPR with 0 enables all external interrupts.
5.
CR8 is used to prioritize external interrupts and is referred to as the task-priority register ( TPR ).
6.
I even dated a DOS devotee for four years, and nothing much stuck except the phrase " external interrupt ."
7.
External interrupts have to be synchronized with the four-clock instruction cycle, otherwise there can be a one instruction cycle jitter.
8.
CP notifies a virtual machine of a pending message or status information by making an external interrupt code X'4000'pending to the virtual machine.
9.
:External interrupts are triggered by falling / rising edges or high / low potential at the interrupt port, leading to an interrupt request ( IRQ ) in the controller.
10.
Transitions between modes are at the discretion of the executing thread when the transition is from a level of high privilege to one of low privilege ( as from kernel to user modes ), but transitions from lower to higher levels of privilege can take place only through secure, hardware-controlled " gates " that are traversed by executing special instructions or when external interrupts are received.
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