Renesas M32R/ECU Series User Manual page 389

10
(2) Event count mode
In event count mode, the timer uses an external input signal (TIN24, TIN26 or TIN28) as the clock source for
the counter.
Note: • TIN25, TIN27 and TIN29 cannot be used as the clock source for the counter.
By detecting the rising and falling edges of the external input signal (TIN24, TIN26 or TIN28), the timer
generates clock pulses synchronized to the microcomputer's internal clock. When after setting the counter
the timer is enabled (by writing to the enable bit in software), the counter starts counting up from the set count
value synchronously with the generated clock. An interrupt request can be generated by a counter overflow.
To stop the counter, disable count by writing to the enable bit in software or fix the external input signal either
"high" or "low".
TIN24
(TIN26, TIN28)
Counter value
Figure 10.7.4 Typical Operation in TID Event Count Mode (Basic Operation)
TIN24
(TIN26, TIN28)
Counter value
TID interrupt request
due to overflow
Figure 10.7.5 Typical Operation in TID Event Count Mode (when Overflow Occurs)
7FFF 8000 8001
FFFD FFFE FFFF
MULTIJUNCTION TIMERS
10.7 TID (Input-Related 16-Bit Timer)
8002 8003
0000 0001
10-146
8004
0002 0003
32180 Group User's Manual (Rev.1.0)