Figure 10-23 Setup Procedure for Input Capture (Example)
•
Examples of input capture
Figure 10-24 illustrates input capture when the falling edge of TIOCB and both edges of
TIOCA are selected as capture edges. TCNT is cleared by input capture into GRB.
Figure 10-24 Input Capture (Example)
Input selection
Select input-capture input
Start counter
Input capture
Set TIOR to select the input capture function of a
general register and the rising edge, falling edge,
or both edges of the input capture signal. Clear the
port data direction bit to 0 before making these
TIOR settings.
Set the STR bit to 1 in TSTR to start the timer
counter.
1
2
1.
2.
H'0005
H'0180
Time
H'0180
H'0160
H'0005
H'0000
TIOCB
TIOCA
GRA
GRB
Counter cleared by TIOCB
input (falling edge)
TCNT value
H'0160
344
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