If a high priority interrupt
arrives it may not get serviced until the RTOS re-enables interrupts again.
For example, if a low priority interrupt
is received by the CPLD and the processor does not need to transition from its low power state, the CPLD can create a register indicating pending interrupts.
These monitors also send a priority interrupt
signal when low pressure is detected, making the gas controllers immediately aware of any potential problem.
Performance counter interrupts execute at the highest kernel priority level (spldevrt), but are deferred while running non-interruptible PALcode [Sites and Witek 1995] or system code at the highest priority level.(6) Events in PALcode and high- priority interrupt
code are still counted, but samples for those events will be associated with the instruction that runs after the PALcode finishes or after the interrupt level drops below spldevrt.
The core also supplies a six-level priority interrupt
controller and a three-stage pipeline that needs no instruction or data caches, data forwarding, hazard detection or branch prediction.
interrupt.c and .h--This module contains an implementation of high and low priority interrupts
The ZLR16300 is now available in 1k, 2k, 4k, 8k and 16k memory sizes with many key features, including low power consumption, two standby modes, special architecture to automate both generation and reception of complex pulses or signals, six priority interrupts
, high and low voltage detection with flag, programmable watch-dog/power-on reset circuits, two independent comparators with programmable interrupt polarity and programmable mask options.