Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 9 Function Timer(FTM)
FEUL620Q504 9–43
9.3.7.2 Start/Stop Operations by Event Trigger
Here is the setting used to control the counter by event triggers.
1) FTnTRG0 setting
Enable/Disable counter start/stop by event triggers
Set whether or not to clear the counter at stop by an event trigger
Set whether or not to accept the next counter start after stop by an event trigger
Set the event trigger source (EXI0-7TGO, TIMER0-7INT, FTM0-3TGO)
2) FTnTRG1 setting
Set the edge of the event trigger which generates counter start
Set the edge of the event trigger which generates counter stop
3) Controlling FTnCON0
Set FTnTGEN to "1" to enter the waiting state for event triggers.
Then, set FTnRUN to "1" to start the counter by the software.
Set FTnRUN to "0" during the counter operation to stop the counter by the software.
Because the trigger signal is sampled at FTnCK when the external input (EXInTGO) is selected as counter
control by event triggers, the input pulse width should be set to Analog filter 200ns and three or more sampling
clocks. Pulses shorter than three sampling clock may be or may not be removed. Note that the sampling is not
performed when the timer interrupt is selected as the event trigger.
Figure 9-8 shows the sampling timing of the external input.
Figure 9-8 Sampling Timing of External Input
FTnCK
External input pin
Sampling clock
Waveform after the sampling
FTMn accepts external input