October 2002
Intermediate to advanced
430 pages
14h 57m
English
Content preview from Embedded Systems Design, 2nd Edition
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194 Embedded systems design
function. If the PC memory subsystem detects a parity error, the
parity circuitry asserts the NMI. The associated ISR does very little
except stop the processing and flash up a window on the PC saying
that a parity error has occurred and please restart the machine.
Recognising an interrupt
The start of the whole process is the recognition of an
interrupt. Internal interrupts are normally defined by the manu-
facturer and are already hardwired. External interrupts, however,
are not and can use a variety of mechanisms.
Edge triggered
With the edge triggered interrupt, it is the clock edge that is
used to generate the interrupt. ...
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