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186
User’s Manual U11969EJ3V0UM00
CHAPTER 7 TIMER/COUNTER FUNCTION (REAL-TIME PULSE UNIT)
7.5.5 Capture operation
A capture operation that captures and holds the count values of TM1 and loads them to a capture register in
asynchronization with an external trigger can be performed. The trigger divided by the valid edge from the external
interrupt request input pin INTP1n is used as the capture trigger. In synchronization with this capture trigger signal,
the count values of TM1n during counting, are captured and loaded to the capture register and the interrupt request
INTCP1n is simultaneously issued. The value of the capture register is retained until the next capture trigger is
generated.
Table 7-4. Capture Trigger Signal to 24-Bit Capture Register
Capture Trigger Signal
Capture Register
Interrupt Request
INTP10
CP10/CP10L
INTCP10
Divide of INTP11
CP11/CP11L
INTCP11
Divide of INTP12
CP12/CP12L
INTCP12
Divide of INTP12/INTP13
CP13/CP13L
INTCP13
The valid edge of the INTP1n input is set by the external interrupt mode registers (INTM2, INTM3). The frequency
dividing ratio of the INTCP11 to INTCP13 triggers is set by the EDVCn register and the EVS register. For the details,
refer to 5.3.9 Frequency divider.
Figure 7-14. Example of TM1 Capture Operation
Remark ESE
←
1
EDVC1
←
2
EDVC2
←
3
CE1
←
1
(Count starts)
OVF1
←
1
(Overflow)
CS1
←
1
Software
clear
D3
FFFFFFH
D2
D0
D1
D2
D3
D4
D5
D6
D7
D2
D5
TM1
count value
INTP12
INTCP12
INTCP13
CP12
CP13
0H
D1
D5
D7
D0
D4
D6
)
(
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