Operation In Tio Noise Processing Input Mode - Renesas M32R/ECU Series User Manual

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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.
Count clock
Enable bit
External input
(noise processing)
H'FFFF
Counter
H'0000
Reload 0 register
TIO interrupt request
Note: • This diagram does not show detailed timing information.
Figure 10.4.8 Typical Operation in Noise Processing Input Mode
Enabled
(by writing to
the enable bit)
Invalid
H'A000
H'A000
MULTIJUNCTION TIMERS
10.4 TIO (Input/Output-Related 16-Bit Timer)
Invalid Effective signal
width
TIO interrupt request due
10-116
Disabled by underflow
to underflow
32180 Group User's Manual (Rev.1.0)