May 2014
Beginner to intermediate
216 pages
8h 42m
English
Content preview from Programming for Microprocessors
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Control of peripheral
devices
(2)
111
Many systems have two or more peripherals that need to be serviced
by interrupts. These devices will usually all be connected to the IRQ
line,
and an interrupt can be generated by any one of them. The inter-
rupt routine must then begin by polling all the interrupt-causing devices
to discover which one actually produced the interrupt.
Often two or more devices will require service at the same time.
When the first device is serviced, the IRQ line will still be held low by
the other devices. The effect is that an RTI instruction simply returns
control to the beginning of the interrupt routine, and the pollin ...
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