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Section 11 16-Bit Cycle Measurement Timer (TCM)
(2)
Input Capture
The value in TCMCNT is transferred to TCMICR by detecting input edge of TCMCYI pin in
timer mode. At this time, the ICPF flag in TCMCSR is set. Detection of rising or falling edges is
selectable with the setting of the IEDG bit in TCMCR. Figure 11.4 shows an example of the
timing of input capture operations and figure 11.5 shows buffer operation of input capture.
φ
TCMCYI
Input capture
signal
TCMCNT
TCMICR
ICPF
Figure 11.4 Input Capture Operation Timing (Sensing of Rising Edges)
φ
TCMCYI
Input capture
signal
TCMCNT
TCMICR
TCMICRF
Rev. 1.00 May 09, 2008 Page 304 of 954
REJ09B0462-0100
N - 1
N
M
N - 1
M
L
Figure 11.5 Buffer Operation of Input Capture
N + 1
N
N
N
M
N + 2
N + 3
0
0 + 1
0
N
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