November 2004
Beginner
368 pages
19h 44m
English
Content preview from The Circuit Designer's Companion, 2nd Edition
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Digital circuits 223
Interrupts
For similar reasons to those outlined above, it is preferable not to rely on edge-sensitive
interrupt inputs. Such an interrupt can be set by a noise spike as readily as by its proper
signal. Undoubtedly edge-sensitive interrupts are necessary in some applications, but
in these cases you should treat them in the same way as clock inputs to latches or flip-
flops and take extra precautions in layout and drive impedance to minimise their noise
susceptibility. If you have a choice in the design implementation, then favour a level-
sensitive interrupt input.
6.5.2 Data and memory protection
Volatile memory (RAM, as distinct ...
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