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Description of Application Circuits
Using one MB3773, this application circuit monitors multiple microprocessor in one system. Signals from each
microprocessor are sent to FF1, FF2 and FF3 clock inputs. Figure 2 shows these timings. Each flip-flop operates
using signals sent from microprocessor as its clock pulse. When even one signal stops, the relevant receiving
flip-flop stops operating. As a result, cyclical pulses are not generated at output Q
arriving at the CK terminal of the MB3773, the MB3773 generates a reset signal.
Note that output Q
frequency f will be in the following range, where the clock frequencies of CK1, CK2 and CK3
3
are f
, f
and f
respectively.
1
2
3
1
1
1
--- -
-- -
--- -
+
f
f
f
0
1
where f
is the lowest frequency among f
0
1
1
--- -
+
--- -
f
f
2
3
, f
and f
1
2
3
.
MB3773
Since the clock pulse stops
.
3
23
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