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(2) Measurement of two pulse widths with free-running counter
When 16-bit timer counter 00 (TM00) is operated in free-running mode, it is possible to simultaneously measure
the pulse widths of the two signals input to the TI000 pin and the TI010 pin.
When the edge specified by bits 4 and 5 (ES000 and ES001) of prescaler mode register 00 (PRM00) is input to
the TI000 pin, the value of TM00 is taken into 16-bit timer capture/compare register 010 (CR010) and an interrupt
request signal (INTTM010) is set.
Also, when the edge specified by bits 6 and 7 (ES100 and ES101) of PRM00 is input to the TI010 pin, the value
of TM00 is taken into 16-bit timer capture/compare register 000 (CR000) and an interrupt request signal
(INTTM000) is set.
Specify both the rising and falling edges as the edges of the TI000 and TI010 pins, by using bits 4 and 5 (ES000
and ES001) and bits 6 and 7 (ES100 and ES101) of PRM00.
Sampling is performed at the interval selected by prescaler mode register 00 (PRM00), and a capture operation is
only performed when the valid level of the TI000 pin or TI010 pin is detected twice, thus eliminating noise with a
short pulse width.
Figure 6-20. Control Register Settings for Measurement of Two Pulse Widths with Free-Running Counter
7
TMC00
0
7
CRC00
0
ES101
PRM00
1
Remark 0/1: Setting 0 or 1 allows another function to be used simultaneously with pulse width measurement.
See the description of the respective control registers for details.
124
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
(a) 16-bit timer mode control register 00 (TMC00)
6
5
4
TMC003
TMC002
0
0
0
0
(b) Capture/compare control register 00 (CRC00)
6
5
4
3
CRC002
0
0
0
0
(c) Prescaler mode register 00 (PRM00)
ES100
ES001
ES000
3
1
1
1
0
Preliminary User's Manual U16846EJ1V0UD
TMC001
OVF00
1
0/1
0
Free-running mode
CRC001
CRC000
1
0
1
CR000 used as capture register
Captures valid edge of TI010 pin to CR000
CR010 used as capture register
2
PRM001
PRM000
0
0/1
0/1
Selects count clock (setting "11" is prohibited).
Specifies both edges for pulse width detection.
Specifies both edges for pulse width detection.
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