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The Interrupt flag (IF) is a flag bit in the CPU's FLAGS register, which determines whether or not the (CPU) will respond immediately to maskable hardware interrupts. [1] If the flag is set to 1 maskable interrupts are enabled. If reset (set to 0) such interrupts will be disabled until
The hardware interrupt signals are all active low, and are as follows: [1] RESET a reset signal, level-triggered NMI a non-maskable interrupt, edge-triggered IRQ a maskable interrupt, level-triggered ABORT a special-purpose, non-maskable interrupt (65C816 only, see below), level-triggered
Even in a CPU which supports nested interrupts, a handler is often reached with all interrupts globally masked by a CPU hardware operation. In this architecture, an interrupt handler would normally save the smallest amount of context necessary, and then reset the global interrupt disable flag at the first opportunity, to permit higher priority ...
A hardware interrupt is a condition related to the state of the hardware that may be signaled by an external hardware device, e.g., an interrupt request (IRQ) line on a PC, or detected by devices embedded in processor logic (e.g., the CPU timer in IBM System/370), to communicate that the device needs attention from the operating system (OS) [7] or, if there is no OS, from the bare metal ...
Causes an interrupt when zero. rT, the trap address register Used to store the address of the trip vector. rTT, the dynamic trap address register Used to store the address of the trap vector. rK, the interrupt mask register Used to enable and disable specific interrupts. rQ, the interrupt request register Used to record interrupts as they occur.
Clock-comparator subclass mask 0 21 CPU-timer subclass mask 0 22 Service-signal subclass mask 0 24 Set to 1 0 25 Interrupt-key subclass mask 0 26 Set to 1 0 27 ETR subclass mask 0 28 Program-call-fast 0 29 Crypto control 1 0 Primary space-switch-event control 1 1-19 Primary segment-table origin 1 22 Primary subspace-group control 1 23
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A further two pins, Sense A and B, were connected to bits 4 and 5. Sense A was normally used to service interrupts (see details below). Interrupts could be turned off by setting bit 3, Interrupt Enable (IE) to 0 with the Disable Interrupt instruction, DINT, and enabled with IEN, or by moving the value to and from A and manipulating it there.