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10.4 TIO (Input/Output-Related 16-Bit Timer)
MULTIJUNCTION TIMERS
32180 Group User’s Manual (Rev.1.0)
10.4.10 Operation in TIO Noise Processing Input Mode
In noise processing input mode, the timer is used to detect that the input signal remained in the same state for
over a predetermined time.
In noise processing input mode, a high or low level on external input activates the counter and if the input signal
remains in the same state for over a predetermined time before the counter underflows, the counter generates
an interrupt request before stopping. If the valid-level signal being applied turns to an invalid level before the
counter underflows, the counter temporarily stops counting and when a valid-level signal is entered again, the
counter is reloaded with the initial count and restarts counting. The effective count width is (reload 0 register set
value + 1).
The timer stops at the same time the counter underflows or count is disabled by writing to the enable bit. An
interrupt request can be generated by a counter underflow.
Figure 10.4.8 Typical Operation in Noise Processing Input Mode
H'FFFF
H'0000
Reload 0 register
External input
(noise processing)
H'A000
Effective signal
width
Invalid
Disabled by underflow
H'A000
Count clock
Counter
Enabled
(by writing to
the enable bit)
TIO interrupt request
Enable bit
Note: • This diagram does not show detailed timing information.
Invalid
TIO interrupt request due
to underflow
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